Elvers, Barbara, ed...[et.al.]
Ullmann's encyclopedia of industrial chemistry - vol. a 13 - 5th rev. ed. - weinheim VCH Verlagsgesellschaft 1989 - 668 p.
vol. A 13 - High Performance fibers to Imidazole and Derivatives
3-527-20113-6
CHEMICAL ENGINEERING-ENCYCLOPEDIA
66(03) / U4
Ullmann's encyclopedia of industrial chemistry - vol. a 13 - 5th rev. ed. - weinheim VCH Verlagsgesellschaft 1989 - 668 p.
vol. A 13 - High Performance fibers to Imidazole and Derivatives
3-527-20113-6
CHEMICAL ENGINEERING-ENCYCLOPEDIA
66(03) / U4