@article{DAN_1973_212_6_a8,
     author = {Kh. Kh. Murtazin},
     title = {The continuous spectrum of second order differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {1301--1304},
     publisher = {mathdoc},
     volume = {212},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_6_a8/}
}