@article{DE_2004_40_6_a3,
     author = {I. T. Kiguradze and S. V. Mukhigulashvili},
     title = {On {Nonlinear} {Boundary} {Value} {Problems} for {Two-Dimensional} {Differential} {Systems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {747--755},
     publisher = {mathdoc},
     volume = {40},
     number = {6},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_6_a3/}
}