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MR ZblFarley, Reuben W. An Iseomorphism Theorem for Positive Commutative Semigroups on the Plane. Mathematica slovaca, Tome 23 (1973) no. 2, pp. 136-146. http://geodesic.mathdoc.fr/item/MASLO_1973_23_2_a6/
@article{MASLO_1973_23_2_a6,
author = {Farley, Reuben W.},
title = {An {Iseomorphism} {Theorem} for {Positive} {Commutative} {Semigroups} on the {Plane}},
journal = {Mathematica slovaca},
pages = {136--146},
year = {1973},
volume = {23},
number = {2},
mrnumber = {0335673},
zbl = {0255.22005},
language = {en},
url = {http://geodesic.mathdoc.fr/item/MASLO_1973_23_2_a6/}
}
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