@article{VTAMU_2018_23_124_a1,
     author = {A. Khellaf},
     title = {New sufficient conditions in the generalized spectrum approach to deal with spectral pollution},
     journal = {Vestnik rossijskih universitetov. Matematika},
     pages = {595--604},
     publisher = {mathdoc},
     volume = {23},
     number = {124},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VTAMU_2018_23_124_a1/}
}