@article{PIM_1965_N_S_05_19_a7,
     author = {Lazar Rusov},
     title = {On {Some} {First} {Integrals} {Of} {Equations} {Of} {Motion}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {69 },
     publisher = {mathdoc},
     volume = {_N_S_05},
     number = {19},
     year = {1965},
     url = {http://geodesic.mathdoc.fr/item/PIM_1965_N_S_05_19_a7/}
}