@article{DE_2006_42_1_a4,
     author = {G. V. Radzievskii},
     title = {On the norms of {Riesz} projections onto subspaces of root functions of a boundary value problem for a functional-differential expression},
     journal = {Differencialʹnye uravneni\^a},
     pages = {48--60},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_1_a4/}
}