Nasarov,I.N.; Kusnetzov,N.V.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1960 , p. 236 - 242
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1960 , # 2 p. 259 - 266

Wittig; Waltnitzki
Chemische Berichte, 1934 , vol. 67, p. 667,673