@article{10_4153_CMB_1964_043_6,
     author = {Clark, Colin},
     title = {On {Rellich's} {Theorem} {Concerning} {Infinitely} {Narrow} {Tubes}},
     journal = {Canadian mathematical bulletin},
     pages = {435--440},
     year = {1964},
     volume = {7},
     number = {3},
     doi = {10.4153/CMB-1964-043-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-043-6/}
}