@article{DAN_1983_272_3_a4,
     author = {V. P. Soltan},
     title = {$d$-convexity in graphs},
     journal = {Doklady Akademii Nauk},
     pages = {535--537},
     publisher = {mathdoc},
     volume = {272},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_272_3_a4/}
}