@article{bortnikov-cohen99,
 author =  "Edi Bortnikov and Reuven Cohen",
 title = " Schemes for Scheduling of Control Messages by Hierarchical Protocols",
 journal =  "Computer Communications",
 volume = 22,
 number = 5,
 month =  may,
 year =   1999,
 note = {An earlier version of this paper was presented in Infocom'98}
}