François Baccelli Bartlomiej Blaszczyszyn Mohamed Kadhem Karray Blocking rates in large CDMA networks via a spatial Erlang formula. 58-67 2005 conf/infocom/2005 INFOCOM http://dx.doi.org/10.1109/INFCOM.2005.1497879 db/conf/infocom/infocom2005.html#BaccelliBK05