@article{TRSPY_1989_187_a8,
     author = {L. D. Kudryavtsev},
     title = {On some questions of spectral theory for differential equations, whose coefficients have irregular points},
     journal = {Informatics and Automation},
     pages = {130--142},
     publisher = {mathdoc},
     volume = {187},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1989_187_a8/}
}