@article{IVM_2013_12_a5,
     author = {P. V. Bibikov},
     title = {Projective equivalence of smooth functions on a~plane},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {69--71},
     publisher = {mathdoc},
     number = {12},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2013_12_a5/}
}