Rothenpieler, P. , Kruger, D. , Pfisterer, D. , Fischer, S. , Dudek, D. , Haas, C. , Zitterbart, M.. "FleGSens – Secure Area Monitoring Using Wireless Sensor Networks". World Academy of Science, Engineering and Technology, Open Science Index 32, International Journal of Electronics and Communication Engineering (2009), 3(8), 1629 - 1640.