@article{DE_1984_20_5_a14,
     author = {V. I. Plotnikov and M. I. Sumin},
     title = {Optimal control of distributed parameter systems described by nonsmooth {Goursat--Darboux} systems with constraints of inequality type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {851--860},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_5_a14/}
}