Suh, Y.-J., and B. H. Kim. “Riemannian Embedding Banks for Common Spatial Patterns With EEG-Based SPD Neural Networks”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 1, May 2021, pp. 854-62, https://ojs.aaai.org/index.php/AAAI/article/view/16168.