@article{IVM_1996_11_a8,
     author = {Yu. V. Pokornyi and O. Yu. Litmanovich and V. P. Plaksina},
     title = {On multivalued differentials of piecewise-smooth functions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {73--84},
     publisher = {mathdoc},
     number = {11},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1996_11_a8/}
}