Efstathios D. Sykas D. E. Karvelas Emmanuel N. Protonotarios Combined URN and TDMA scheme for multiple-access protocols. 199-207 1983 6 Computer Communications 4 http://dx.doi.org/10.1016/0140-3664(83)90059-2 db/journals/comcom/comcom6.html#SykasKP83