O. Schrape, F. Winkler, and E. Graß. An All-Digital Phase-Locked Loop with High Resolution for Local On-Chip Clock Synthesis. Springer-Verlag, volume 6448, 2011.

T. Ohlemüller, F. Winkler, and E. Graß. Radio Localization in OFDM networks using the Round Trip Phase. Positioning, Navigation and Communication 2010 (WPNC'10), IEEE, March 2010.