Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts
@article{PIM_1968_N_S_08_22_a1, author = {Lazar Rusov}, title = {On {First} {Integrals} {Of} {The} {Equations} {Of} {Motion} {Of} {The} {Form} dxi/dt = aij {\ensuremath{\partial}\ensuremath{\Phi}/\ensuremath{\partial}xj}}, journal = {Publications de l'Institut Math\'ematique}, pages = {5 }, publisher = {mathdoc}, volume = {_N_S_08}, number = {22}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/PIM_1968_N_S_08_22_a1/} }
Lazar Rusov. On First Integrals Of The Equations Of Motion Of The Form dxi/dt = aij ∂Φ/∂xj. Publications de l'Institut Mathématique, _N_S_08 (1968) no. 22, p. 5 . http://geodesic.mathdoc.fr/item/PIM_1968_N_S_08_22_a1/