Ullmann's encyclopedia of industrial chemistry
Fritz Ullmann
Fritz Ullmann, Wolfgang Gerhartz, Y. Stephen Yamamoto, F. Thomas Campbell,
Rudolf Pfefferkorn, James F. Rounsaville. Cresols and Xylenols Helmut Fiege,
Bayer AG, ... Helens in 1980 [7]. Cresols are important chemical raw materials.