A.  Bevilacqua and Mazzanti, A., ?Doubly-Tuned Transformer Networks: A Tutorial?, IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 68, pp. 550-555, 2021.

A.  Mazzanti and Bevilacqua, A., ?Second-Order Equivalent Circuits for the Design of Doubly-Tuned Transformer Matching Networks?, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 65, no. 12, pp. 4157 - 4168, 2018.