@article{10_4153_CJM_1969_012_5,
     author = {Carlson, R. E. and Cullen, C. G.},
     title = {A {Characterization} of {Intrinsic} {Functions} on},
     journal = {Canadian journal of mathematics},
     pages = {136--146},
     year = {1969},
     volume = {21},
     number = {1},
     doi = {10.4153/CJM-1969-012-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-012-5/}
}