Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS_1945__59_1_a0, author = {{\CYRZH}. {\CYRA}{\cyrd}{\cyra}{\cyrm}{\cyra}{\cyrr}}, title = {On problems of difficult apparent}, journal = {Matemati\v{c}eskij sbornik}, pages = {3--8}, publisher = {mathdoc}, volume = {59}, number = {1}, year = {1945}, zbl = {0063.01846}, language = {fr}, url = {http://geodesic.mathdoc.fr/item/MS_1945__59_1_a0/} }
Ж. Адамар. On problems of difficult apparent. Matematičeskij sbornik, Tome 59 (1945) no. 1, pp. 3-8. http://geodesic.mathdoc.fr/item/MS_1945__59_1_a0/