@article{ZNSL_1983_128_a14,
     author = {N. A. Razumovskii},
     title = {On the {Green} function of a slightly heterogeneous waveguide},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {139--148},
     publisher = {mathdoc},
     volume = {128},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_128_a14/}
}