1. 1) G. Guruvich : J. Oil Col. Chem. Assoc., 53,669 (1970)
2. 2) H. Grabitsch, K. Heckel, C. Monstad : F. u. L, 70, 3,167 (1964)
3. 3) Dr. Peter Kresse : F. u. L, 76, 11, 1099 (1970)
4. 4) J. E. 0. Mayne : J. Oil Col. Chem. Assoc., 40,183 (1957)
5. 9) J. A. W. Van Laar : Paint Varnish Production, July, Aug., Oct, (1961)