@article{ZVMMF_1994_34_5_a1,
     author = {R. Gabasov and F. M. Kirillova and E. A. Kostina},
     title = {Piecewise-linear functions of several variables; their modelling, local behaviour and extrema},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {658--668},
     year = {1994},
     volume = {34},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1994_34_5_a1/}
}