%0 Journal Article %A A. P. Markeev %T On normal coordinates in the vicinity of the Lagrangian libration points of the restricted elliptic three-body problem %J Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki %D 2020 %P 657-671 %V 30 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VUU_2020_30_4_a8/ %G ru %F VUU_2020_30_4_a8