@article{MZM_1975_18_4_a9,
     author = {V. A. Yurko},
     title = {The inverse problem for differential operators of second order with regular boundary conditions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {569--576},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_4_a9/}
}