@article{INTG_1969_2_a5,
     author = {L. E. Evtushik},
     title = {Differential connections and infinitesimal transformations of a~prolonged pseudogroup},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {119--150},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1969_2_a5/}
}