@ARTICLE{aw02tow,
     AUTHOR = {I.F. Akyildiz and W. Wang},
     TITLE = {{A Dynamic Location Management Scheme for
     Next Generation Multi-Tier PCS Systems}},
     JOURNAL = {IEEE Transactions on Wireless Communications},
     VOLUME = "1",
     NUMBER = "1",
     PAGES = "2040-2052",
     MONTH = "January",
     YEAR = "2002"}
     OPTNOTE = inter-system