@article{DAN_1972_203_4_a5,
     author = {I. S. Kats},
     title = {Power-asymptotic estimates for spectral functions of generalized boundary value problems of second order},
     journal = {Doklady Akademii Nauk},
     pages = {752--755},
     publisher = {mathdoc},
     volume = {203},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_203_4_a5/}
}