Voir la notice de l'article provenant de la source Hellenic Digital Mathematics Library
@article{EUA_1992-1993__6_a3, author = {I. G. Petrofskiy}, title = {\ensuremath{\Sigma}\ensuremath{\upsilon}\ensuremath{\nu}\ensuremath{\eta}\ensuremath{\theta}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\nu}\ensuremath{\varepsilon}\ensuremath{\varsigma} {\ensuremath{\Delta}\ensuremath{\iota}\ensuremath{\alpha}\ensuremath{\varphi}o\ensuremath{\rho}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\epsilon}\ensuremath{\varsigma}} {E\ensuremath{\xi}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\acute\omega}\ensuremath{\sigma}\ensuremath{\varepsilon}\ensuremath{\iota}\ensuremath{\varsigma}}}, journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} A }, pages = {77-139}, publisher = {mathdoc}, volume = {6}, year = {1992-1993}, language = {gr}, url = {http://geodesic.mathdoc.fr/item/EUA_1992-1993__6_a3/} }
I. G. Petrofskiy. Συνηθισμένες Διαφορικές Εξισώσεις. Ευκλείδης Α , Tome 6 (1992-1993), p. 77-139. http://geodesic.mathdoc.fr/item/EUA_1992-1993__6_a3/