@article{IM2_1981_17_1_a2,
     author = {E. M. Vorob'ev},
     title = {Reduction of differential equations with symmetries},
     journal = {Izvestiya. Mathematics},
     pages = {73--86},
     year = {1981},
     volume = {17},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1981_17_1_a2/}
}