@article{INTO_2006_108_a0,
     author = {S. V. Znamenskii and E. A. Znamenskaya},
     title = {Convexity of a set on the plane in a~given direction},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {5--66},
     publisher = {mathdoc},
     volume = {108},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2006_108_a0/}
}