Baek, Chung, and Thomas Jackman. “Safe-Haven Assets for U.S. Equities During the 2020 COVID-19 Bear Market”. Economics and Business Letters 10, no. 3 (August 2, 2021): 331–335. Accessed April 25, 2024. https://reunido.uniovi.es/index.php/EBL/article/view/15335.