@article{10_4153_CJM_1997_012_8,
     author = {Edward, Julian},
     title = {Spectral {Theory} for the {Neumann} {Laplacian} on {Planar} {Domains} {With} {Horn-Like} {Ends}},
     journal = {Canadian journal of mathematics},
     pages = {232--262},
     year = {1997},
     volume = {49},
     number = {2},
     doi = {10.4153/CJM-1997-012-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1997-012-8/}
}