@article{DE_1992_28_10_a13,
     author = {A. M. Nakhushev},
     title = {A criterion for continuity of the gradient of the solution of the {Darboux} problem for the {Gellerstedt} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1770--1785},
     publisher = {mathdoc},
     volume = {28},
     number = {10},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_10_a13/}
}