@article{DBLP:journals/cacm/Clark81,
author = {Gordon M. Clark},
title = {Use of Polya Distributions in Approximate Solutions to Nonstationary
M/M/s Queues},
journal = {Commun. ACM},
volume = {24},
number = {4},
year = {1981},
pages = {206-217},
ee = {http://doi.acm.org/10.1145/358598.358620},
bibsource = {DBLP, http://dblp.uni-trier.de}
}