Da San Martino, G., A. Sperduti, F. Aiolli, and A. Moschitti. “Efficient Online Learning for Mapping Kernels on Linguistic Structures”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 33, no. 01, July 2019, pp. 3421-8, doi:10.1609/aaai.v33i01.33013421.