v.Hahn et al.
Helvetica Chimica Acta, 1956 , vol. 39, p. 341,344
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Robinson; Tomlinson
Journal of the Chemical Society, 1935 , p. 467,469

v.Hahn et al.
Helvetica Chimica Acta, 1956 , vol. 39, p. 341,344

Lal; Dutt Proceedings of the National Institute of Sciences of India, 1937 ,  vol. 3, p. 377,385