@ARTICLE{was01lt,
     AUTHOR = {W. Wang and I.F. Akyildiz and G.L. St\"{u}ber},
     TITLE = {{An Optimal Paging Scheme of Minimizing Signaling Costs
            Under Delay Bounds}},
     JOURNAL = "IEEE Communications Letters",
     VOLUME = "5",
     NUMBER = "2",
     PAGES = "42-45",
     MONTH = "February",
     YEAR = "2001"}