Nikolaew; Uschakow
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1957 , p. 1235,1236; engl. Ausg. S. 1257, 1258
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Hopf; Muehlethaler
Kunstst.Plastics, 1957 , vol. 4, p. 257,258,263
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Hopff
Bulletin de la Societe Chimique de France, 1958 , p. 1283,1284