1
published 1969
Kostenfrei, H ; 41 (2008)-
Kostenfrei, Verlag
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3
by Wywcki, Hubert
Published in Demonstratio Mathematica (1989)
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by Cristea, Mihai
Published in Demonstratio Mathematica (1989)
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by Popenda, Jerzy
Published in Demonstratio Mathematica (1989)
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by Sasin, Wiesław
Published in Demonstratio Mathematica (1989)
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