Maria José Doménech-Benlloch José Manuel Giménez-Guzmán Vicent Pla Vicente Casares Giner Jorge Martínez-Bauset Solving Multiserver Systems with Two Retrial Orbits Using Value Extrapolation: A Comparative Perspective. 56-70 2009 ASMTA http://dx.doi.org/10.1007/978-3-642-02205-0_5 conf/asmta/2009 db/conf/asmta/asmta2009.html#Domenech-BenllochGPGM09