@article{MZM_1996_60_3_a7,
     author = {N. N. Metel'skii and V. N. Martynchik},
     title = {Partial convexity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {406--413},
     publisher = {mathdoc},
     volume = {60},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_3_a7/}
}