An overview of online charging in 3GPP networks: new ways of utilizing user, network, and service-related information. Grgic, T. & Matijasevic, M. INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, 23(2):81–100, 2013.
doi  bibtex   
@article{WOS:000316275100002,
author = {Grgic, Tomislav and Matijasevic, Maja},
doi = {10.1002/nem.1816},
issn = {1055-7148},
journal = {INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT},
number = {2},
pages = {81--100},
title = {{An overview of online charging in 3GPP networks: new ways of utilizing user, network, and service-related information}},
volume = {23},
year = {2013}
}

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