@article{Raskutti2007Enhanced,
    author = {G. Raskutti and A. Zalesky and E. W. M. Wong and M. Zukerman},
    title = {Enhanced blocking probability evaluation method for circuit-switched trunk reservation networks},
    journal = {IEEE Communications Letters},
    volume = {11},
    number = {6},
    pages = {543-545},
    month = {Jun.},
    year = {2007},
    abstract = {We consider the problem of estimating steady-state blocking probability for circuit-switched networks that allow alternate routing with particular emphasis on networks protected by trunk reservation. We use a recently proposed blocking probability estimate, the Overflow Priority Classification Approximation (OPCA) as an alternative to the currently used Erlang's Fixed-Point Approximation (EFPA). We demonstrate empirically that OPCA provides a better blocking estimate than EFPA for circuit-switched networks with alternate routing, that are reasonably protected by trunk reservation.}
    
}