@article{SVFU_2018_25_a2,
     author = {A. I. Kozhanov and O. S. Zikirov},
     title = {Boundary value problems for twice degenerate differential equations with multiple characteristics},
     journal = {Matemati\v{c}eskie zametki SVFU},
     pages = {34--44},
     publisher = {mathdoc},
     volume = {25},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SVFU_2018_25_a2/}
}