@article{TRSPY_2015_288_a8,
     author = {O. R. Musin and A. S. Tarasov},
     title = {Extremal problems of circle packings on a~sphere and irreducible contact graphs},
     journal = {Informatics and Automation},
     pages = {133--148},
     year = {2015},
     volume = {288},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2015_288_a8/}
}