@article{IVM_1976_5_a13,
     author = {L. N. Kuskovskii},
     title = {A~generalization of the theory of areolar derivatives},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {112--115},
     year = {1976},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_5_a13/}
}