1. Physical interventions to interrupt or reduce the spread of respiratory viruses: systematic review;Jefferson;British Medical Journal,2008
2. Aiello AE, Murray G, Coulborn R, Noone A, Monto A S. Mask Use Reduces Seasonal Influenza-like Illness in the Community Setting. Ann Arbor, MI: University of Michigan, School of Public Health (unpublished); 2008 cited in http://www.mykosen-online.de/infos/icaac_2008/Virusinfektionen.pdf, slide 65.
3. WHO. Advice on the use of masks in the community setting in Influenza A (H1N1) outbreaks: Interim guidance. May 3, 2009. http://www.who.int/csr/resources/publications/Adviceusemaskscommunityrevised.pdf.
4. WHO. WHO Guidelines for Communicating with the Public during an Outbreak. Geneva, 2005. http://www.who.int/csr/resources/publications/WHO_CDS_2005_32web.pdf.
5. Mexico. Plan Nacional de Preparación y Respuesta ante una Pandemia de Influenza (National Plan for Preparation and Response to an Influenza Pandemic), August 2006, http://www.fao.org/docs/eims/upload//221482/national_plan_ai_mex_es.pdf.