@article{DE_2000_36_6_a16,
     author = {V. I. Zhegalov and A. N. Mironov},
     title = {Three-dimensional characteristic problems with normal derivatives in boundary conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {833--836},
     publisher = {mathdoc},
     volume = {36},
     number = {6},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_6_a16/}
}