-
参考文献
Aspelund Acta Academiae Aboensis, Series B: Mathematica et Physica, 1936 , vol. 10, # 2 p. 5 Acta Academiae Aboensis, Series B: Mathematica et Physica, 1936 , vol. 10, # 9 p. 3 Chem. Zentralbl., 1937 , vol. 108, # II p. 1817,2004
Aspelund Acta Academiae Aboensis, Series B: Mathematica et Physica, 1936 , vol. 10, # 2 p. 5 Acta Academiae Aboensis, Series B: Mathematica et Physica, 1936 , vol. 10, # 9 p. 3 Chem. Zentralbl., 1937 , vol. 108, # II p. 1817,2004