@article{CMFD_2023_69_4_a0,
     author = {A. V. Boltachev},
     title = {On ellipticity of operators with shear mappings},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {565--577},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2023_69_4_a0/}
}