Liu, C., X. Li, G. Cai, Z. Dong, H. Zhu, and L. Shang. “Noninvasive Self-Attention for Side Information Fusion in Sequential Recommendation”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 5, May 2021, pp. 4249-56, https://ojs.aaai.org/index.php/AAAI/article/view/16549.