Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS_1948__65_3_a3, author = {{\CYRL}.{\CYREREV}. {\CYREREV}{\cyrl}{\cyrsftsn}{\cyrs}{\cyrg}{\cyro}{\cyrl}{\cyrsftsn}{\cyrc}}, title = {{\CYRI}{\cyrz}{\cyrm}{\cyre}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyre} {\cyrt}{\cyro}{\cyrp}{\cyro}{\cyrl}{\cyro}{\cyrg}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrishrt} {\cyrs}{\cyrt}{\cyrr}{\cyru}{\cyrk}{\cyrt}{\cyru}{\cyrr}{\cyrery} {\cyrp}{\cyro}{\cyrv}{\cyre}{\cyrr}{\cyrh}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyre}{\cyrishrt} {\cyru}{\cyrr}{\cyro}{\cyrv}{\cyrn}{\cyrya}}, journal = {Matemati\v{c}eskij sbornik}, pages = {399--418}, publisher = {mathdoc}, volume = {65}, number = {3}, year = {1948}, zbl = {0034.20901}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1948__65_3_a3/} }
Л.Э. Эльсгольц. Изменение топологической структуры поверхностей уровня. Matematičeskij sbornik, Tome 65 (1948) no. 3, pp. 399-418. http://geodesic.mathdoc.fr/item/MS_1948__65_3_a3/