Leglise J., Finot, L., Van Gestel, J. N. M. and Duchet, J. C., “Conversion of Model Sulfur Compounds to Characterize Hydrodesulfurization Co-Mo/Al2O3 Catalyst, in B. Delmon, G. F. Froment and P. Grange (eds.)” Hydrotreating and Hydrocracking of Oil Fractions, Elsevier, 127, 51 (1999).
 Muegge B. and Massoth, F. E., “Comparison of Hydrotreating Catalyst Deactivation by Coking With Vaccum Gas Oil vs. Anthracene, in C. H. Bartholomew and Butt, J. B., (eds.), “Catalyt Deactivation”, Elsevier, 68,297 (1991).
 Richardson, S. M., Nagaishi, H. and Gray, M.R., “Initial Coke Deposition on Ni-Mo/g-Al2O3 Bitumene Hydroprocessing Catalyst”, Ind. Eng. Chem. Res., 35, 3940 (1996).
 Froment, G. F., “Coke Formation in Catalytic Process; Kinetics and Catalyst Deactivation”, in C. H. Bartholomew and G. A. Fuentes (eds.) “Catalyst Deactivation”, Elsevier, 126 ,53(1997).
 Gorra, F., Scribano, G., Christens, P., Andersen, K. V. and Casaro, O. G., “ New Catalyst Improved Presulfiding Results in 4+ Year Hydrotreatment”, Oil & Gas J., 23 Aug., 39 (1993).
 Lulic P., Zrncevic, S., Meider, H. and Sevdic, D., “The Relation Between the Quality of Catalyst and Feedstock in Hydrotreating Process”, in D. L. Trimm, S. Akashah, M. Absi-Halabi, and A. Bishara (eds.), “Catalysts in Petroleum Refining”, Elsevier, 451(1989).
 Furimsky, E. and Massoth, F. E., “Deactivation of Hydroprocessing Catalysts”, Cat. Today, 52, 381(1992).
 Smith, J. M., “Chemical Engineering Kinetics”, McGraw-Hill, New York,265 (1981).
 Krishna, A. K., Diffusional Influences on Catalyst Deactivation, Catal. Rev. Sci. Eng., 32 (4),279 (1991).
 Takalsuka, T., Wada, Y. and Inone, S., “A Catalyst Deactivation Model For Residual Oil HDS and Application to Deep HDS of Diesel Fuel”, Ame. Chem. Soc., 414 (1996).
 Fogler, H. S., “Elements of Chemical Reaction Engineering”, Prentice- Hall, p. 738 (1992).
 Fatemi, Sh., Abolhamd, G., Moosavian, M.A. and Mortazavi, Y., "The Empirical model of HDS reaction from gas oil by Ni-Mo/Al2O3 Catalysts", The Fifth National Congress of Chemical Eng., Shiraz, April, 24-27 (2000).
 Petersen, E. E., “The Fouling of Catalysts; Experimental Observation and Modeling” in E.E. Petersen and A. T. Bell (eds.), “ Catalyst Deactivation” Marcel Dekker,(1987).
 Fatemi Sh., Abolhamd, G., Moosavian, M.A. and Mortazavi, Y., “Investigation and Comparison of Ni-Mo/Al2O3 Catalysts Activity in Hydrode-sulfurization Reaction of Thiophene in Gas Oil”, J. Faculty Eng., 35 (2), 169 (2001). Fatemi, Sh., “Determination of Deactivating Parameters of HDS Catalysts and Their Effects on Kinetic Model at Steady and Transitional State”, Ph. D. Dissertation , Dep. of Chemical Eng., Faculty of Eng., University of Tehran, (2001).