48. R.P. Gardner, K. Verghese, and D. Betel, “Simple Mathematical Models for Nondispersive Xray Fluorescence Gauges”, Transactions of the American Nuclear Society, 15, (2), pp. 708709 (1972). 
49. R.P. Gardner, D. Betel, and K. Verghese, “XRay Fluorescence Analysis of Heterogeneous Material: Effects of Geometry and Secondary Fluorescence”, International Journal of Applied Radiation and Isotopes, 24, pp. 135l46 (1973). 
62. W.L. Dunn, C.R. Efird, R.P. Gardner, and K. Verghese, “A Mathematical Model for Tertiary XRays from Heterogeneous Samples”, XRay Spectrometry, 4, pp. 1825 (1975).

63. R.P. Gardner and A.R. Hawthorne, “Monte Carlo Simulation of XRay Fluorescence from Homogeneous Samples Including Tertiary Interelement Effects”, XRay Spectrometry, 4, pp. 138l48 (1975).

66. L. Wielopolski and R.P. Gardner, “A Simple Accurate Model for Correcting XRF PulseHeight Spectra for Pulse Pile Up”, Transactions of the American Nuclear Society, Supplement No. 3, 21, pp. 394l (l975).

67. A.R. Hawthorne and R.P. Gardner, “Monte Carlo Models for the Inverse Calculation of Multielement Amounts in XRF Analysis”, Transactions of the American Nuclear Society, Supplement No. 3, 21, pp. 3839 (1975). 
68. F. Arinc and R.P. Gardner, “Models for Correcting Backscatter Nonlinearities in XRF PulseHeight Spectra”, Transactions of the American Nuclear Society, Supplement No. 3, 21, pp. 3738 (1975).

69. A.R. Hawthorne and R.P. Gardner, “ Monte Carlo Simulation of XRay Fluorescence from Homogeneous Multielement Samples Excited by Continuous and Discrete Energy Photons from XRay Tubes”, Analytical Chemistry, 47, pp. 22202225 (1975). 
71. A.R. Hawthorne, R.P. Gardner, and T.G. Dzubay, “ Monte Carlo Simulation of SelfAbsorption Effects in Elemental XRF Analysis of Atmospheric Particulates Collected on Filters”, Advances in XRay Analysis, 19, pp. 323337 (1975).

72. F. Arinc, R.P. Gardner, L. Wielopolski, and A.R. Stiles, “Application of the LeastSquares Method to the Analysis of XRF Spectral Intensities from Atmospheric Particulates Collected on Filters”, Advances in XRay Analysis, 19, pp. 367379 (1975).

75. A.R. Hawthorne and R.P. Gardner, “Fundamental Parameters Solution to the XRay Fluorescence Analysis of NickelIronChromium Alloys Including Tertiary Corrections”, Analytical Chemistry, 48, pp. 21302l35 (l976).

77. A.R. Hawthorne and R.P. Gardner, “Chapter 18. Monte Carlo Applications to the XRay Fluorescence Analysis of Aerosol Samples”, in XRAY FLUORESCENCE ANALYSIS OF ENVIRONMENTAL SAMPLES, T. G. Dzubay (ed.), Ann Arbor Science Publishers, Inc., Ann Arbor, Michigan, 1977, pp. 209220. 
78. F. Arinc, L. Wielopolski, and R.P. Gardner, “Chapter 20. Linear LeastSquares Analysis of XRay Fluorescence Spectra of Aerosol Samples Using Pure Element Library Standards and Photon Excitation”, in XRAY FLUORESCENCE ANALYSIS OF ENVIRONMENTAL SAMPLES, T.G. Dzubay (ed.), Ann Arbor Science Publishers, Inc., Ann Arbor, Michigan, 1977, pp. 277240.

87. R.P. Gardner, L. Wielopolski, and K. Verghese, “Application of Selected Mathematical Techniques to EnergyDispersive XRay Fluorescence Analysis”, Atomic Energy Review, 15, (4), pp. 701754 (l977). 
88. R.P. Gardner, L. Wielopolski, and J.M. Doster, “Adaptation of the Fundamental Parameters Monte Carlo Simulation to EDXRF Analysis with Secondary Fluorescer XRay Machines”, Advances in XRay Analysis, 21, pp. 129l42 (1978). 
89. R.P. Gardner, L. Wielopolski, and K. Verghese, “Mathematical Techniques for Quantitative Elemental Analysis by Energy Dispersive XRay Fluorescence”, Journal of Radioanalytical Chemistry, 43, pp. 611643 (1978).

91. R.P. Gardner and J.M. Doster, “Corrections to the ThirdOrder Formula for XRay Fluorescence Intensities”, Analytical Chemistry, 50, (12), 1703 (1978).

93. A.R. Hawthorne and R.P. Gardner, “A Proposed Model for ParticleSize Effects in the XRay Fluorescence Analysis of Heterogeneous Powders that Induces Incidence Angle and NonRandom Packing Effects”, XRay Spectrometry, 7 (4), pp. 198205 (1978). 
96. L. Wielopolski and R.P. Gardner, “Development of the Detector Response Function Approach for the Library LeastSquares Analysis of EnergyDispersive XRay Fluorescence Spectra”, Advances in XRay Analysis, 22, pp. 317323 (1979).

97. R.P. Gardner and J.M. Doster, “The Reduction of Matrix Effects in XRay Fluorescence Analysis by the Monte Carlo Fundamental Parameters Method”, Advances in XRay Analysis, 22, pp. 343356 (1979). 
100. L. Wielopolski and R.P. Gardner, “Development of the Detector Response Function Approach in the LeastSquares Analysis of XRay Fluorescence Spectra”, Nuclear Instruments and Methods, 165, pp. 297306 (1979).

101. F. Arinc and R.P. Gardner, “ Monte Carlo Simulation of the Backscatter Region in PhotonExcited Energy Dispersive XRay Fluorescence Spectra”, Journal of Radioanalytical Chemistry, 54 (12), pp. 221234 (l979).

104. J.M. Doster and R.P. Gardner, “ Monte Carlo Simulation of Sample Scattering Effects from Homogeneous Samples Excited by Monoenergetic Photons”, Advances in XRay Analysis, 23, pp. 117124 (1980). 
111. J.M. Doster and R.P. Gardner, “ Monte Carlo Studies on the Design of Radioisotope Source Holders and Shields for EDXRF Analyzers”, Advances in XRay Analysis, 24, pp. 413415 (1981).

118. Robin P. Gardner, Joseph M. Doster, and Kuruvilla Verghese, “On the Development of a Calibration Method for XRay Fluorescence and Prompt GammaRay Analyzers Based on Monte Carlo Simulation”, Transactions of the American Nuclear Society, 43, pp. 250251 (1982).

119. Joseph M. Doster and Robin P. Gardner, “The Complete Spectral Response for EDXRF Systems  Calculation by Monte Carlo and Analysis Applications. 1. Homogeneous Samples”, XRay Spectrometry, 11, (4), pp. 173180 (1982). 
120. Joseph M. Doster and Robin P. Gardner, “The Complete Spectral Response for EDXRF Systems  Calculation by Monte Carlo and Analysis Applications. 2. Heterogeneous Samples”, XRay Spectrometry, 11, (4), pp. 181186 (1982). 
126. A.M. Yacout, R.P. Gardner, and K. Verghese, “Cubic Spline Techniques for Fitting XRay Cross Sections”, Nuclear Instruments and Methods in Physics Research, 220, 461472 (1984).

137. A.M. Yacout, R.P. Gardner and K. Verghese, “A SemiEmpirical Model for the XRay Si(Li) Detector Response Function”, Nuclear Instruments and Methods in Physics Research, A243, 121130 (1986).

141. A.M. Yacout, K. Verghese and R.P. Gardner, “Cubic Spline Representation of the TwoVariable Cumulative Distribution Functions for Coherent and Incoherent XRay Scattering”, XRay Spectrometry, 15, 259265 (1986).

148. A.M. Yacout, R.P. Gardner, and K. Verghese, “Monte Carlo Simulation of the XRay Fluorescence Spectra from Multielement Homogeneous and Heterogeneous Samples”, Advances in XRay Analysis, Vol.30, 121132 (1987). 
158. K. Verghese, M. Mickael, T. He, and R.P. Gardner, “A New Analysis Principle for EDXRF: The Monte Carlo  Library LeastSquares Principle”, Advances in XRay Analysis, Vol. 31, 461469 (1988).

176. C.L. Dobbs, J. Szalanski, E.O. King, R.P. Gardner, W. Elhentaty, and K. Verghese, “Calibration and Error Analysis Approaches for Optimum Use of Dual Radiation Gauges for OnLine Aluminum Thickness Measurement”, Transactions of the American Nuclear Society, 63, 141 (1991).

177. T. He, C.L. Dobbs, K. Verghese, and R.P. Gardner, “Investigation of EnergyDispersive Xray Fluorescence Analysis for OnLine Aluminum Thickness/Composition Measurement”, Transactions of the American Nuclear Society, 63, 147148 (1991). 
182. T. He, R.P. Gardner, and K. Verghese, “NCSXRF: A General Geometry Monte Carlo Simulation Code for EDXRF Analysis”, Advances in XRay Analysis, Volume 35B, pp. 727736 (1991). 
191. T. He, R.P. Gardner, and K. Verghese, “The Monte Carlo  Library LeastSquares Approach for EnergyDispersive XRay Fluorescence Analysis”, Applied Radiation and Isotopes, Vol. 44, No. 10/11, pp. 13811388 (1993).

224. R.P. Gardner, S.H. Lee, C.W. Mayo, E.S. El Sayyed, and A. Sood, “Monte CarloAssisted Quality Assurance for In Vivo and In Situ Elemental Analysis Using Nuclear Analytical Techniques”, Transactions of the American Nuclear Society, Vol. 79, pp. 2021, 1998.

230. Q. Ao, R.P. Gardner, J. Iwanczyk, and L. Wielopolski, “In Vivo XRF Spectroscopy: Summary of Workshop II” Denver XRay Conference, Advances in XRay Analysis [CD ROM], ICDD, Newtown Square, PA, pp. 898909 (1999).

270. Robin P. Gardner and Weijun Guo, “Development of a Monte Carlo  Library LeastSquares (MCLLS) Code Package for the EDXRF Inverse Problem”, Advances in XRay Analysis, Volume 48, pp. 253265, 2005.

278. Robin P. Gardner, Fusheng Li, and Weijun Guo, “Use of the Monte Carlo Simulation Code CEARXRF for the EDXRF Inverse Problem”, International Center for Diffraction Data, 242254, 2006. 
294. Fusheng Li, Weijun Guo, and Robin P. Gardner, “Implementation of the Monte Carlo  Library LeastSquares Approach to Energy Dispersive XRay Fluorescence Analysis”, Advances in XRay Analysis, Volume 51, 9 pages (2007). 