@article{ZNSL_1993_208_a9,
     author = {N. M. Gulevich},
     title = {On measure of nonconvexity and {Jung} constant},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {174--181},
     publisher = {mathdoc},
     volume = {208},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1993_208_a9/}
}