@article{SJVM_2015_18_2_a4,
     author = {E. A. Kotel'nikov},
     title = {Non-convex minimization of a~quadratic function on a~sphere},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {163--176},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2015_18_2_a4/}
}