Campaigne; Yodice
Journal of Heterocyclic Chemistry, 1980 , vol. 17, # 4 p. 661 - 665

Kukalenko,S.S.
Journal of Organic Chemistry USSR (English Translation), 1970 , vol. 6, p. 682 - 685
Zhurnal Organicheskoi Khimii, 1970 , vol. 6, # 4 p. 680 - 684

Campaigne; Yodice
Journal of Heterocyclic Chemistry, 1980 , vol. 17, # 4 p. 661 - 665

Kresze,G. et al.
Chemische Berichte, 1961 , vol. 94, p. 2060 - 2072
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Kukalenko,S.S.
Journal of Organic Chemistry USSR (English Translation), 1970 , vol. 6, p. 682 - 685
Zhurnal Organicheskoi Khimii, 1970 , vol. 6, # 4 p. 680 - 684

Bayer AG
Patent: DE2515146 , 1976 ;
Chem.Abstr., 1977 , vol. 86, # 71947