@article{10_4153_CJM_1967_073_x,
     author = {Sheehan, J.},
     title = {On {P\'olya's} {Theorem}},
     journal = {Canadian journal of mathematics},
     pages = {792--799},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-073-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-073-x/}
}