@article{IM2_1979_13_2_a1,
     author = {V. G. Vinokurov and N. N. Ganikhodzhaev},
     title = {Conditional functions in the trajectory theory of dynamical systems},
     journal = {Izvestiya. Mathematics },
     pages = {221--252},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1979_13_2_a1/}
}