@article{DE_1996_32_10_a18,
     author = {V. I. Zhegalov and V. A. Sevastyanov},
     title = {The {Goursat} problem in four-dimensional space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1429--1430},
     publisher = {mathdoc},
     volume = {32},
     number = {10},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_10_a18/}
}