@article{MZM_1977_21_2_a2,
     author = {V. A. Strakhov},
     title = {Some questions in the theory of inverse problems for differential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {151--160},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_2_a2/}
}