Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_192_5_a14, author = {Nguy\^en van Dao}, title = {On the oscillations of systems which are nearly essentially nonlinear}, journal = {Doklady Akademii Nauk}, pages = {1004--1006}, publisher = {mathdoc}, volume = {192}, number = {5}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_5_a14/} }
Nguyên van Dao. On the oscillations of systems which are nearly essentially nonlinear. Doklady Akademii Nauk, Tome 192 (1970) no. 5, pp. 1004-1006. http://geodesic.mathdoc.fr/item/DAN_1970_192_5_a14/