@article{ZNSL_1998_250_a6,
     author = {V. Yu. Gotlib},
     title = {Helmgoltz equation solutions concentrated near periodical boundary},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {83--96},
     publisher = {mathdoc},
     volume = {250},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1998_250_a6/}
}