On Ptak's combinatorial lemma.
Simons, S.
Pacific J. Math., Tome 43 (1972) no. 3, p. 719-721 / Harvested from Project Euclid
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Publié le : 1972-05-14
Classification:  46A05 
@article{1102968571,
     author = {Simons, S.},
     title = {On Ptak's combinatorial lemma.},
     journal = {Pacific J. Math.},
     volume = {43},
     number = {3},
     year = {1972},
     pages = { 719-721},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102968571}
}

Simons, S. On Ptak's combinatorial lemma.. Pacific J. Math., Tome 43 (1972) no. 3, pp.  719-721. http://gdmltest.u-ga.fr/item/1102968571/