OSREDKAR, Professor Joško. The COVID-19 Pandemic, Seasons and the Vitamin D Laboratory Strategy. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 56, n. 2, p. 182–189, 2021. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/12287. Acesso em: 18 sep. 2025.