@article{RM_1998_53_3_a9,
     author = {S. A. Stepin},
     title = {On the spectral properties of the non-self-conjugate operator $i\varepsilon\dfrac{d^2}{dx^2}+q(x)$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {639--641},
     year = {1998},
     volume = {53},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1998_53_3_a9/}
}