@article{IIMI_2012_1_a36,
     author = {I. V. Lisachenko and V. I. Sumin},
     title = {On singular controls in the sense of the maximum principle for terminal optimization problem connected with {Goursat{\textendash}Darboux} system},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {80--81},
     year = {2012},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2012_1_a36/}
}