参考文献
Schmidt, K. F.
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1924 , vol. 2, # 7 p. 7 - 32
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Schmidt, K. F.
Angewandte Chemie, 1923 , vol. 36, p. 511
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Schmidt, K. F.
Ber., 1924 , vol. 57, p. 704