@article{VTGU_2017_50_a3,
     author = {T. G. Ehrgashev},
     title = {The fourth double-layer potential for a generalized bi-axially symmetric {Helmholtz} equation},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {45--56},
     publisher = {mathdoc},
     number = {50},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2017_50_a3/}
}