@article{MZM_1970_8_5_a9,
     author = {L. P. Kuptsov},
     title = {Some estimates of solutions of degenerate $(k,0)$-elliptic equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {625--634},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_5_a9/}
}