Coupled inductors-based chaotic Colpitts oscillators: Mathematical modeling and synchronization issuesV. Kamdoum Tamba, H. B. Fotsin, J. Kengne, F. Kapche Tagne and P. K. TallaEur. Phys. J. Plus, 130 7 (2015) 137DOI: https://doi.org/10.1140/epjp/i2015-15137-x