@article{IM2_1973_7_2_a10,
     author = {I. S. Kats},
     title = {Generalization of an asymptotic formula of {V.\,A.~Marchenko} for spectral functions of a~second-order boundary value problem},
     journal = {Izvestiya. Mathematics },
     pages = {424--438},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_2_a10/}
}