A note on the convexity of the expected queue length of the M / M / s queue with respect to the arrival rate: A third proof. Mehrez, A.; Brimberg, J. — 1992 Journal of Applied Mathematics and Stochastic Analysis
Properties of ordinary and weighted sums of order p used for distance estimation J. Brimberg; R. F. Love — 1995 RAIRO - Operations Research - Recherche Opérationnelle