Le Fevre Journal of the Chemical Society, 1933 , p. 977,980 Full Text Show Details 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