Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1999_29_3a_1, author = {I.D. Albu and D. Oprig}, title = {D. {Oprig:} {Helmholtz} type condition for mechanical integrators}, journal = {Novi Sad Journal of Mathematics}, pages = {11-21}, publisher = {mathdoc}, volume = {29}, number = {3}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1999_29_3a_1/} }
I.D. Albu; D. Oprig. D. Oprig: Helmholtz type condition for mechanical integrators. Novi Sad Journal of Mathematics, Tome 29 (1999) no. 3. http://geodesic.mathdoc.fr/item/NSJOM_1999_29_3a_1/