@article{DAN_1991_319_5_a2, author = {N. S. Bojinov}, title = {Sufficient conditions for the basis property, convergence and summability of the root expansion of a nonlocal {Sturm--Liouville} problem}, journal = {Doklady Akademii Nauk}, pages = {1042--1047}, publisher = {mathdoc}, volume = {319}, number = {5}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_5_a2/} }