Signalling for handover in a broadband cellular ATM system. - Klaus Keil; Hajo-Erich Bakker; Wolfgang Schödl; Manfred Litzenburger (Broadband Communications, 1998)

Very Tight Coupling of Wireless LANs and UMTs Networks: A Technical Challenge and an Opportunity for Mobile Operators. - Manfred Litzenburger; Hajo-Erich Bakker; Stephen Kaminski; Klaus Keil (PWC, 2002)

Throughput Maximization under Rate Requirements for the OFDMA Downlink Channel with Limited Feedback. - Gerhard Wunder; Chan Zhou 001; Hajo-Erich Bakker; Stephen Kaminski (EURASIP J. Wirel. Commun. Netw., 2008)