Shen, Z., T. Shen, Z. Lin, and J. Ma. “PDO-eS2CNNs: Partial Differential Operator Based Equivariant Spherical CNNs”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 11, May 2021, pp. 9585-93, doi:10.1609/aaai.v35i11.17154.