Hyunseung Choo Hee Yong Youn Daewoo Chung Modified Virtual Layer Scheme for Location Management. 712-724 2002 conf/icoin/2002-1 ICOIN (1) http://link.springer.de/link/service/series/0558/bibs/2343/23430712.htm db/conf/icoin/icoin2002-1.html#ChooYC02