@article{ZNSL_1975_51_a14,
     author = {N. V. Zepelev},
     title = {On some special solutions for {Helmholtz} equation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {197--202},
     publisher = {mathdoc},
     volume = {51},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1975_51_a14/}
}