@article{VMJ_2004_6_4_a5,
     author = {A. G. Kusraev and S. S. Kutateladze},
     title = {Convex extensional operators},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {31--41},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2004_6_4_a5/}
}