@article{TIMM_2015_21_1_a25,
     author = {A. A. Uspenskii},
     title = {Necessary conditions for the existence of pseudovertices of the boundary set in the {Dirichlet} problem for the eikonal equation},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {250--263},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2015_21_1_a25/}
}