58. R.P. Gardner and K. Verghese, “A Model with Closed Form Analytic Solution for SteadyState, ClosedCircuit Comminution Processes”, Powder Technology, 11, pp. 8788 (1975).

70. R.P. Gardner and R.S. Rogers, “A TwoComponent Mechanistic Approach for the Comminution of Heterogeneous Material”, Powder Technology, 12, pp. 247258 (1975).

73. R.P. Gardner and K. Verghese, “TanksinSeries Transient Models for the Determination of Model Simulation Parameters in Continuous, ClosedCircuit Comminution Processes”, Proceedings of the Fourth European Symposium on Comminution, Nurnberg, Germany, March, 1975, pp. 489504. 
81. R.S. Rogers and R.P. Gardner, “A Modified Method for Obtaining Model Parameters in the TwoComponent Mechanistic Approach for Material that Exhibits Heterogeneous Breakage Characteristics in Comminution Processes”, Powder Technology, 16, pp. 281284 (1977).

85. R.P. Gardner, R.S. Rogers, and K. Verghese, “ShortLived Radioactive Tracer Methods for the Dynamic Analysis and Control of Continuous Comminution Processes by the Mechanistic Approach”, International Journal of Applied Radiation and Isotopes, 28, pp. 86l87l (1977). 
107. Reed S.C. Rogers, Robin P. Gardner, Bert Bergstrom, and Mohammed Siddique, “An Evaluation of the Short Lived Radioactive Tracer Method for Determining Mechanistic Model Parameters for Comminution Processes”, Proceedings of Powder and Bulk Solids Conference, Chicago, Illinois, May 1315, 1980, 4 pages. 
108. R.P. Gardner, R.S.C. Rogers, and K. Verghese, “Development and Use of a ShortLived Radioactive Tracer Method for Applying the Mechanistic Approach to Industrial, Continuous Ball Mills”, Proceedings of the Fifth European Symposium on Comminution, June 35, 1980, Amsterdam, The Netherlands, pp. 621639.

112. ShuiLung Bosco Yu and Robin P. Gardner, “The Preparation and Use of Radioactive Tracers for the Study of Comminution Processes. Part I. Homogeneous Materials”, Powder Technology, 30, pp. 265275 (1981). 
113. Robin P. Gardner, HsienMo Lee, ShuiLung Bosco Yu, and Reed S.C. Rogers, “The Preparation and Use of Radioactive Tracers for the Study of Comminution Processes. Part II. Heterogeneous or Multicomponent Materials”, Powder Technology, 30, pp. 277287 (1981). 
117. Robin P. Gardner, Mourad Aissa, and Kuruvilla Verghese, “Determination of Ball Mill Residence Time Distributions from Tracer Data Taken in ClosedCircuit Operation”, Powder Technology, 32, pp. 253266 (1982). 
125. Mourad Aissa, Robin P. Gardner, and Kuruvilla Verghese, “The OnStream Simultaneous Determination of Breakage Rate and Residence Time Distribution Parameters in ClosedCircuit Comminution Processes with Radiotracers”, Chapter 8 of Control ’84, John A. Herbst (ed.) Published by the Society of Mining Engineers of the AIME, New York, 1984. 
127. R.P. Gardner, M. Aissa, and K. Verghese, “A Model with ClosedForm Analytic Solution for SteadyState, ClosedCircuit, Linear Comminution Processes Based on the CrossFlow, FiniteStage Residence Time Distribution Model”, Powder Technology, 39, 143145 (1984).
