Wegmann; Dahn
Helvetica Chimica Acta, 1946 , vol. 29, p. 101,108
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van Risseghem
Bulletin des Societes Chimiques Belges, 1938 , vol. 47, p. 208
Riobe
Annales de Chimie (Cachan, France), 1949 , vol. <12>4, p. 628
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Crombie; Harper
Journal of the Chemical Society, 1950 , p. 1707,1712