Qvist
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1935 , vol. 8, # 4 p. 7,26
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Qvist
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1949 , vol. 17, # 6 p. 3,10

Qvist
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1934 , vol. 8, # 4 p. 3,25
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1949 , vol. 17, # 6 p. 3,6