Crespí Rotger, S., and J. M. Ordóñez Iriarte. “The Relevance of Air Hygiene: An Urgent Matter After the COVID-19 Pandemic”. Spanish Journal of Environmental Health, vol. 22, no. 1, June 2022, pp. 81-90, https://ojs.diffundit.com/index.php/rsa/article/view/1153.