@article{10_4153_CJM_1976_088_1,
     author = {Anderson, Robert L.},
     title = {Limit {Point} and {Limit} {Circle} {Criteria} for a {Class} of {Singular} {Symmetric} {Differential} {Operators}},
     journal = {Canadian journal of mathematics},
     pages = {905--914},
     year = {1976},
     volume = {28},
     number = {5},
     doi = {10.4153/CJM-1976-088-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-088-1/}
}