L. C. Meher, D. Vidya Sagar and S. N. Naik, “Technical Aspects of Biodiesel Production by Transesterification— A Review,” Renewable and Sustainable Energy Reviews, Vol. 10, No. 3, 2006, pp. 248-268.
 M. Kim, C. DiMaggio, S. Yan, S. O. Salley and K. Y. S. Ng, “The Synergistic Effect of Alcohol Mixtures on Transesterification of Soybean Oil Using Homogeneous and Heterogeneous Catalysts,” Applied Catalysis A: General, Vol. 378, No. 2, 2010, pp. 134-143.
 J. Zhang, S. Chen, R. Yang and Y. Yan, “Biodiesel Production from Vegetable Oil Using Heterogenous Acid and Alkali Catalyst,” Fuel, Vol. 89, No. 10, 2010, pp. 2939-2944. http://dx.doi.org/10.1016/j.fuel.2010.05.009
 Z. Helwani, M. R. Othman, N. Aziz, J. Kim and W. J. N. Fernando, “Solid Heterogeneous Catalysts for Transesterification of Triglycerides with Methanol: A Review,” Applied Catalysis A: General, Vol. 363, No. 1-2, 2009, pp. 1-10. http://dx.doi.org/10.1016/j.apcata.2009.05.021
 C. Ngamcharussrivichai, P. Totarat and K. Bunyakiat, “Ca and Zn Mixed Oxide as a heterogeneous Base Catalyst for Transesterification of Palm Kernel Oil,” Applied Catalysis A: General, Vol. 341, No. 1-2, 2008, pp. 77-85.
 A. Kawashima, K. Matsubara and K. Honda, “Development of Heterogeneous Base Catalysts for Biodiesel Production,” Bioresource Technology, Vol. 99, No. 9, 2008, pp. 3439-3443.
 J. Boro, D. Deka and A. J. Thakur, “A Review on Solid Oxide Derived from Waste Shells as Catalyst for Biodiesel Production,” Renewable and Sustainable Energy Reviews, Vol. 16, No. 1, 2012, pp. 904-910.
 M. Zabeti, W. M. A. Wan Daud and M. K. Aroua, “Activity of Solid Catalysts for Biodiesel Production: A Review,” Fuel Processing Technology, Vol. 90, No. 6, 2009, pp. 770-777.
 A. P. Chouhan and A. K. Sarma, “Modern Heterogeneous Catalysts for Biodiesel Production: A Comprehensive Review,” Renewable and Sustainable Energy Reviews, Vol. 15, No. 9, 2011, pp. 4378-4399.
 Z. Helwani, M. R. Othman, N. Aziz, W. J. N. Fernando and J. Kim, “Technologies for Production of Biodiesel Focusing on Green Catalytic Techniques: A Review,” Fuel Processing Technology, Vol. 90, No. 12, 2009, pp. 1502-1514. http://dx.doi.org/10.1016/j.fuproc.2009.07.016
 Y. Zhang, M. A. Dube, D. D. McLean and M. Kates, “Biodiesel Production from Waste Cooking Oil: 1. Process Design and Technological Assessment,” Bioresource Technology, Vol. 89, No. 1, 2003, pp. 1-16.
 J. Van Kasteren and A. Nisworo, “A Process Model to Estimate the Cost of Industrial Scale Biodiesel Production from Waste Cooking Oil by Supercritical Transesterification,” Resources, Conservation and Recycling, Vol. 50, No. 4, 2007, pp. 442-458.
 J. M. Encinar, J. F. Gonzalez and A. Rodriguez-Reinares, “Biodiesel from Used Frying Oil. Variables Affecting the Yields and Characteristics of the Biodiesel,” Industrial & Engineering Chemistry Research, Vol. 44, No. 15, 2005, pp. 5491-5499. http://dx.doi.org/10.1021/ie040214f
 A. B. Chhetri, M. S. Tango, S. M. Budge, K. C. Watts and M. R. Islam, “Non-Edible Plant Oils as New Sources for Biodiesel Production,” International Journal of Molecular Sciences, Vol. 9, No. 2, 2008, p. 169.
 M. M. Gui, K. T. Lee and S. Bhatia, “Feasibility of Edible Oil vs. non-Edible Oil vs. Waste Edible Oil as Biodiesel Feedstock,” Energy, Vol. 33, No. 11, 2008, pp. 1646-1653. http://dx.doi.org/10.1016/j.energy.2008.06.002
 Y. C. Sharma and B. Singh, “Development of Biodiesel: Current Scenario,” Renewable and Sustainable Energy Reviews, Vol. 13, No. 6-7, 2009, pp. 1646-1651.
 A. E. Atabani, A. S. Silitonga, I. A. Badruddin, T. M. I. Mahlia, H. H. Masjuki and S. Mekhilef, “A Comprehensive Review on Biodiesel as an Alternative Energy Resource and Its Characteristics,” Renewable and Sustainable Energy Reviews, Vol. 16, No. 4, 2012, pp. 2070-2093. http://dx.doi.org/10.1016/j.rser.2012.01.003
 H. J. Berchmans and S. Hirata, “Biodiesel Production from Crude Jatropha curcas L. Seed Oil with a High Content of Free Fatty Acids,” Bioresource Technology, Vol. 99, No. 6, 2008, pp. 1716-1721.
 S.-Y. No, “Inedible Vegetable Oils and Their Derivatives for Alternative Diesel Fuels in CI Engines: A Review,” Renewable and Sustainable Energy Reviews, Vol. 15, No. 1, 2011, pp. 131-149.
 C. C. Enweremadu and M. M. Mbarawa, “Technical Aspects of Production and Analysis of Biodiesel from Used Cooking Oil—A Review,” Renewable and Sustainable Energy Reviews, Vol. 13, No. 9, 2009, pp. 2205-2224.
 B. Freedman, E. H. Pryde and T. L. Mounts, “Variables Affecting the Yields of Fatty Esters from Transesterified Vegetable Oils,” Journal of the American Oil Chemists’ Society, Vol. 61, 1984, pp. 1638-1643.
 J. M. Marchetti, V. U. Miguel and A. F. Errazu, “Possible Methods for Biodiesel Production,” Renewable and Sustainable Energy Reviews, Vol. 11, No. 6, 2007, pp. 1300-1311. http://dx.doi.org/10.1016/j.rser.2005.08.006
 M. Dorado, E. Ballesteros, J. De Almeida, C. Schellert, H. Lohrlein and R. Krause, “An Alkali-Catalyzed Transesterification Process for High Free Fatty Acid Waste Oils,” Transactions of the ASAE, Vol. 45, 2002, pp. 525-529.
 A. Kumar, A. Kumar Tiwari and H. Raheman, “Biodiesel Production from Jatropha Oil (Jatropha curcas) with High Free fatty Acids: An Optimized Process,” Biomass and bioenergy, Vol. 31, No. 8, 2007, pp. 569-575.
 S. V. Ghadge and H. Raheman, “Biodiesel Production from Mahua (Madhuca indica) Oil Having High Free Fatty Acids,” Biomass and Bioenergy, Vol. 28, No. 6, 2005, pp. 601-605.
 D. Y. C. Leung, X. Wu and M. K. H. Leung, “A Review on Biodiesel Production Using Catalyzed Transesterification,” Applied Energy, Vol. 87, No. 1, 2010, pp. 1083-1095. http://dx.doi.org/10.1016/j.apenergy.2009.10.006
 B. M. Bhosle and R. Subramanian, “New Approaches in Deacidification of Edible Oils—A Review,” Journal of Food Engineering, Vol. 69, No. 4, 2005, pp. 481-494.
 M. Blanco, R. Beneyto, M. Castillo and M. Porcel, “Analytical Control of an Esterification Batch Reaction between Glycerine and Fatty Acids by Near-Infrared Spectroscopy,” Analytica Chimica Acta, Vol. 521, No. 2, 2004, pp. 143-148. http://dx.doi.org/10.1016/j.aca.2004.06.003
 P. Felizardo, J. Machado, D. Vergueiro, M. J. N. Correia, J. P. Gomes and J. M. Bordado, “Study on the Glycerolysis Reaction of High Free Fatty Acid Oils for Use as Biodiesel Feedstock,” Fuel Processing Technology, Vol. 92, No. 6, 2011, pp. 1225-1229.
 A. C. Bhattacharyya and D. K. Bhattacharyya, “Deacidification of High FFA Rice Bran Oil by Reesterification and Alkali Neutralization,” Journal of the American Oil Chemists’ Society, Vol. 64, No. 1, 1987, pp. 128-131.
 S. Singh and R. P. Singh, “Deacidification of High Free Fatty Acid-Containing Rice Bran Oil by Non-Conventional Reesterification Process,” Journal of Oleo Science, Vol. 58, No. 2, 2009, pp. 53-56.
 B. K. De and D. K. Bhattacharyya, “Deacidification of High-Acid Rice Bran Oil by Reesterification with Monoglyceride,” Journal of the American Oil Chemists’ Society, Vol. 76, No. 10, 1999, pp. 1243-1246.
 R. O. Ebewele, A. F. Iyayi and F. K. Hymore, “Deacidification of High Acidic Rubber Seed Oil by Reesterification with Glycerol,” International Journal of the Physical Sciences, Vol. 5, No. 6, 2010, pp. 841-846.
 R. Feuge, E. Kraemer and A. Bailey, “Modification of Vegetable Oils. IV. Reesterification of Fatty Acids with Glycerol,” Journal of the American Oil Chemists’ Society, Vol. 22, No. 8, 1945, pp. 202-207.
 Y. Wang, S. Ma, L. Wang, S. Tang, W. W. Riley and M. J. T. Reaney, “Solid Superacid Catalyzed Glycerol Esterification of Free Fatty Acids in Waste Cooking Oil for Biodiesel Production,” European Journal of Lipid Science and Technology, Vol. 114, No. 3, 2012, pp. 315-324.
 L. L. Sousa, I. L. Lucena and F. A. N. Fernandes, “Transesterification of Castor Oil: Effect of the Acid Value and Neutralization of the Oil with Glycerol,” Fuel Processing Technology, Vol. 91, No. 2, 2010, pp. 194-196.