Qian Lv Lv, Q., & Rouskas, G. N. (2011). On optimal tiered structures for network service bundles. 2011 ieee global telecommunications conference (globecom 2011). https://doi.org/10.1109/glocom.2011.6133598 Lv, Q., & Rouskas, G. N. On optimal sizing of tiered network services. 27th IEEE Conference on Computer Communications (Infocom), vols 1-5, 1–5.