@article{VMUMM_1983_1_a20,
     author = {T. I. Chayka},
     title = {Method of spatial characteristics},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {81--84},
     publisher = {mathdoc},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1983_1_a20/}
}