Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1975__25_4_a2, author = {Iwanik, A. and P{\l}onka, J.}, title = {Linear independence in commutative semigroups}, journal = {Mathematica slovaca}, pages = {333--338}, publisher = {mathdoc}, volume = {25}, number = {4}, year = {1975}, mrnumber = {0450431}, zbl = {0335.20031}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1975__25_4_a2/} }
Iwanik, A.; Płonka, J. Linear independence in commutative semigroups. Mathematica slovaca, Tome 25 (1975) no. 4, pp. 333-338. http://geodesic.mathdoc.fr/item/MASLO_1975__25_4_a2/