@article{IM2_2014_78_6_a1,
     author = {I. A. Bogaevsky},
     title = {Implicit ordinary differential equations: bifurcations and sharpening of equivalence},
     journal = {Izvestiya. Mathematics},
     pages = {1063--1078},
     year = {2014},
     volume = {78},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2014_78_6_a1/}
}