Abu S. Reaz Sifat Ferdousi Mohammed Atiquzzaman mSIGMA: An Efficient Handoff Scheme for Multi-Class Networks. 2687-2692 2008 WCNC http://dx.doi.org/10.1109/WCNC.2008.471 conf/wcnc/2008 db/conf/wcnc/wcnc2008.html#ReazFA08