Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS_1951__71_2_a3, author = {{\CYRS}.{\CYRP}. {\CYRF}{\cyri}{\cyrn}{\cyri}{\cyrk}{\cyro}{\cyrv}}, title = {{\CYRS}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}{\cyrery} $W$}, journal = {Matemati\v{c}eskij sbornik}, pages = {349--370}, publisher = {mathdoc}, volume = {71}, number = {2}, year = {1951}, zbl = {0044.18003}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1951__71_2_a3/} }
С.П. Фиников. Системы $W$. Matematičeskij sbornik, Tome 71 (1951) no. 2, pp. 349-370. http://geodesic.mathdoc.fr/item/MS_1951__71_2_a3/