@article{IM2_1971_5_1_a9,
     author = {I. S. Kats},
     title = {Integral characteristics of the growth of spectral functions for generalized second order boundary problems with boundary conditions at a regular end},
     journal = {Izvestiya. Mathematics },
     pages = {161--191},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a9/}
}