@article{TRSPY_2008_260_a16,
     author = {A. L. Skubachevskii},
     title = {On {Necessary} {Conditions} for the {Fredholm} {Solvability} of {Nonlocal} {Elliptic} {Problems}},
     journal = {Informatics and Automation},
     pages = {248--263},
     publisher = {mathdoc},
     volume = {260},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2008_260_a16/}
}