@article{ZVMMF_1973_13_1_a22,
     author = {E. S. Birger},
     title = {On evaluating functionals of the eigenfunctions of a boundary value problem for a system of linear ordinary differential equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {227--233},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1973_13_1_a22/}
}