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.

Barrak, S. El, A. Lyhyaoui, A. El Gonnouni, A. Puliafito, and S. Serrano,  "SVM-MUSIC algorithm for spectrum sensing in cognitive radio ad-hoc networks",  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), vol. 10517, Cham, Springer Verlag, 2017.