Wang, J., Z. Zeng, B. Chen, T. Dai, and S.-T. Xia. “Contrastive Quantization With Code Memory for Unsupervised Image Retrieval”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 36, no. 3, June 2022, pp. 2468-76, doi:10.1609/aaai.v36i3.20147.