1. Burdock, G. A.Encyclopedia of Food and Color Additives; CRC Press: New York, 1997; Vol. 3, pp 371−376, 2485−2486, 2891−2904.
2. Sittig, M.Chemical Technology Review No. 124: PharmaceuticalManufacturing Encyclopedia; Noyes Data Corporation: New Yersey, 1997; p 626.
3. Fiege, H. Cresols and Xylenols.Kirk-Othmer, Encyclopedia of ChemicalTechnology; VCH Verlagsgesellschaft: 1991; Vol. A8, pp 25−59.