@article{IIMI_2005_4_a0,
     author = {I. N. Baranova},
     title = {To {L.} {S.~Pontryagin's} example},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {3--10},
     year = {2005},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2005_4_a0/}
}