@article{FPM_2006_12_5_a17,
     author = {V. A. Yurko},
     title = {The inverse problem for pencils of differential operators on the half-line with turning points},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {237--246},
     publisher = {mathdoc},
     volume = {12},
     number = {5},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2006_12_5_a17/}
}