@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/}
}