@article{MZ_1973__134_171970,
     author = {Ranko Bojanic and Eugene Seneta},
     title = {A {Unified} {Theory} of {Regularly} {Varying} {Sequences.}},
     journal = {Mathematische Zeitschrift},
     pages = {91--106},
     year = {1973},
     volume = {134},
     zbl = {0256.40002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__134_171970/}
}