Doncheva – Dilova, Jaklin, Nikolay Stoilov, Tanja Kuneva, and Vladimira Boyadzhieva. “COVID-19 and Post-COVID-19 Syndrome As an Occupational Disease”. Rheumatology (Bulgaria) 31, no. 4 (March 10, 2024): 60–77. Accessed October 12, 2026. https://rheumatologybg.org/journal/rbj/article/view/58.