%0 Journal Article %A M. V. Popov %A Yu. A. Poveschenko %A V. A. Gasilov %A A. V. Koldoba %A T. S. Poveschenko %T Application of the Richardson method in case of the unknown lower bound of a problem spectrum %J Matematičeskoe modelirovanie %D 2017 %P 96-108 %V 29 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM_2017_29_5_a7/ %G ru %F MM_2017_29_5_a7