PJF Swart, HT Steenstra, FL Muller, WF van der Zwan, P van Genderen, LP Ligthart, GL Reijns, AJC van Gemund (1999), Towards the additional use of phase processing in multistatic FMCW radar, considerations and experimental results, In Conference proceedings. Vol. 1 p.238-241, Microwave Engineering Europe.

MM de Weerdt (1999), Vervoersplanning, In De Vakidioot Volume 1999 p.17-19.