@article{IVM_1983_1_a0,
     author = {M. A. Akivis},
     title = {Completely isotropic submanifolds of a~four-dimensional pseudoconformal structure},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--11},
     publisher = {mathdoc},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1983_1_a0/}
}