@article{DAN_1994_335_5_a0,
     author = {N. S. Bojinov},
     title = {On the root expansion of a nonlocal {Sturm--Liouville} integro-differential operator with an integral part of {Volterra} type},
     journal = {Doklady Akademii Nauk},
     pages = {549--552},
     publisher = {mathdoc},
     volume = {335},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_335_5_a0/}
}