Liu, C., H. Xie, Z.-J. Zha, L. Ma, L. Yu, and Y. Zhang. “Filtration and Distillation: Enhancing Region Attention for Fine-Grained Visual Categorization”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 07, Apr. 2020, pp. 11555-62, doi:10.1609/aaai.v34i07.6822.