TAI-JIN KIM. Vaccine, Emergence, Termination, Sunspot Number as ON-OFF Switch for COVID-19 Pandemic with 25 Worst-Hit Countries. Global Journal of Medical Research, [S. l.], v. 20, n. K11, p. 17–41, 2020. Disponível em: https://medicalresearchjournal.org/index.php/GJMR/article/view/2228. Acesso em: 3 may. 2024.