@article{10_14708_ma_v7i14_1432,
     author = {Teresa Regi\'nska},
     title = {Approximation of eigenvalues of nonselfadjoint problems on an infinite interval},
     journal = {Mathematica Applicanda},
     pages = { 71--77},
     publisher = {mathdoc},
     volume = {7},
     number = {14},
     year = {1979},
     doi = {10.14708/ma.v7i14.1432},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v7i14.1432/}
}