Young-Bae Ko Vinaychandra Shankarkumar Nitin H. Vaidya Medium Access Control Protocols using Directional Antennas in Ad Hoc Networks. 13-21 2000 INFOCOM http://www.ieee-infocom.org/2000/papers/350.pdf db/conf/infocom/infocom2000-1.html#KoSV00