Aspelund; Skoglund
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1937 , vol. 10, # 10 p. 8,15,19,22
Chem. Zentralbl., 1937 , vol. 108, # II p. 2004

Aspelund; Skoglund
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1937 , vol. 10, # 10 p. 8,15,19,22
Chem. Zentralbl., 1937 , vol. 108, # II p. 2004