Voir la notice de l'article provenant de la source Annales Mathematica et Informaticae website
@article{AMI_2005_32_a4, author = {W{\l}odzimierz {\L}enski}, title = {Pointwise very strong approximation as a generalization of {Fej\'er{\textquoteright}s} summation theorem}, journal = {Annales mathematicae et informaticae}, pages = {79--86}, publisher = {mathdoc}, volume = {32}, year = {2005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AMI_2005_32_a4/} }
Włodzimierz Łenski. Pointwise very strong approximation as a generalization of Fejér’s summation theorem. Annales mathematicae et informaticae, Tome 32 (2005), pp. 79-86. http://geodesic.mathdoc.fr/item/AMI_2005_32_a4/