Barrak, S. El, A. El Gonnouni, S. Serrano, A. Puliafito, and A. Lyhyaoui,  "GSM-RF Channel Characterization Using a Wideband Subspace Sensing Mechanism for Cognitive Radio Networks",  WIRELESS COMMUNICATIONS AND MOBILE COMPUTING, vol. 2018, pp. 1?11, 2018.

Barrak, S. El, A. Lyhyaoui, A. El Gonnouni, A. Puliafito, and S. Serrano,  "Application of MVDR and MUSIC spectrum sensing techniques with implementation of Node's prototype for cognitive radio Ad Hoc networks",  ACM International Conference Proceeding Series, vol. 130526, New York, NY 10121-0701, Association for Computing Machinery, 2017.