Morris, C., M. Ritzert, M. Fey, W. L. Hamilton, J. E. Lenssen, G. Rattan, and M. Grohe. “Weisfeiler and Leman Go Neural: Higher-Order Graph Neural Networks”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 33, no. 01, July 2019, pp. 4602-9, doi:10.1609/aaai.v33i01.33014602.