Ciliberto, C; Herbster, M; Ialongo, AD; Pontil, M; Rocchetto, A; Severini, S; Wossnig, L; (2018) Quantum machine learning: a classical perspective. Proceedings Of The Royal Society A: Mathematical, Physical and Engineering Sciences , 474 (2209) , Article 20170551. 10.1098/rspa.2017.0551.