@article{IVM_2002_4_a1,
     author = {V. F. Volkodavov and Yu. A. Ilyushina},
     title = {Characterization of the local extremum principle for an equation of hyperbolic type and its application},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {13--17},
     publisher = {mathdoc},
     number = {4},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2002_4_a1/}
}