Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1981_17_4_a20, author = {S. N. Markov}, title = {Singularities of solutions of second-order equations in a real domain}, journal = {Differencialʹnye uravneni\^a}, pages = {741--743}, publisher = {mathdoc}, volume = {17}, number = {4}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1981_17_4_a20/} }
S. N. Markov. Singularities of solutions of second-order equations in a real domain. Differencialʹnye uravneniâ, Tome 17 (1981) no. 4, pp. 741-743. http://geodesic.mathdoc.fr/item/DE_1981_17_4_a20/