KMT-2019-BLG-0797: Binary-lensing event occurring on a binary stellar system Cheongho Han, Chung-Uk Lee, Yoon-Hyun Ryu, Doeon Kim, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Youn Kil Jung, Hyoun-Woo Kim et al. (11 more) A&A, 649 (2021) A91 Published online: 18 May 2021 DOI: 10.1051/0004-6361/202040149