Evans; Edlund
Industrial and Engineering Chemistry, 1936 , vol. 28, p. 1188
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Shell Devel Co.
Patent: US1968033 , 1931 ;
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N.V.de Bataafsche Petr.Mij.
Patent: DE629601 , 1932 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 23, p. 102