@article{05005311,
title = {Karamata's characterization theorem, Feller, and regular variation in probability theory.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {71(85)},
year = {2002},
pages = {79-89},
doi = {10.2298/PIM0271079S},
zbl = {1088.60008},
language = {en},
url = {http://dml.mathdoc.fr/item/05005311}
}
Seneta, E. Karamata's characterization theorem, Feller, and regular variation in probability theory.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 71(85) (2002) pp. 79-89. doi : 10.2298/PIM0271079S. http://gdmltest.u-ga.fr/item/05005311/