@article{DAN_1988_303_6_a4,
     author = {I. S. Lomov and V. V. Tikhomirov},
     title = {Estimates of root vectors of multipoint spectral problems},
     journal = {Doklady Akademii Nauk},
     pages = {1304--1306},
     publisher = {mathdoc},
     volume = {303},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_303_6_a4/}
}