Stoll; Rouve Helvetica Chimica Acta, 1944 , vol. 27, p. 1570,1578, 1579, 1582 Full Text Show Details Ruzicka Patent: US1702842 , 1926 ; Full Text Show Details Ruzicka Patent: US1702852 , 1926 ; Full Text Show Details Soc. An. Naef and Cie. Patent: DE519446 , 1926 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 17, p. 213