Le Fevre
Journal of the Chemical Society, 1933 , p. 977,980
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Qvist
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1939 , vol. 12, # 1 p. 3,11
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1939 , vol. 12, # 7 p. 3,24