Constructions of positive commutative semigroups on the plane. II.
Farley, Reuben W. (1985)
International Journal of Mathematics and Mathematical Sciences
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Farley, Reuben W. (1985)
International Journal of Mathematics and Mathematical Sciences
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Matthew Gould, Raymond E. Richardson (1983)
Czechoslovak Mathematical Journal
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A. Antonippillai, Francis J. Pastijn (1994)
Mathematica Slovaca
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