@article {545, title = {Doubly-Tuned Transformer Networks: A Tutorial}, journal = {IEEE Transactions on Circuits and Systems II: Express Briefs}, volume = {68}, year = {2021}, pages = {550-555}, doi = {10.1109/TCSII.2020.3046021}, author = {Bevilacqua, A. and A. Mazzanti} }