@article{SF_1996__53_2_135493,
     author = {S.Ya. Yakubov},
     title = {Noncoercive boundary value problems for the {Lapace} equation with a spectral parameter.},
     journal = {Semigroup forum},
     pages = {298--316},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0857.35095},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135493/}
}