1. Ministerio de Salud. Criterios técnicos para actualizar la cifra de fallecidos por COVID-19 en el Perú. 31 May 2021. https://www.gob.pe/institucion/minsa/informes-publicaciones/1944190-criterios-tecnicos-para-actualizar-la-cifra-de-fallecidos-por-covid-19-en-el-peru.
2. Covid-19: Study claims real global deaths are twice official figures
3. Covid-19: Mexico acknowledges 50 000 more deaths than official figures show
4. Covid-19: Russia’s statistics agency reports much higher death toll than country’s health ministry