@article{TIMM_2014_20_1_a28,
     author = {A. V. Chernov},
     title = {On the smoothness of an approximated optimization problem for {a~Goursat{\textendash}Darboux} system on a~varied domain},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {305--321},
     year = {2014},
     volume = {20},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2014_20_1_a28/}
}