The social implications of COVID-19 on daily mobility in major cities in Africa. The case of Yaoundé and Douala (Cameroon)Salifou Ndam, Jérôme Chenal, Armel Kemajou, Abdou Kouomoun and El Bachir DiopE3S Web Conf., 418 (2023) 02003DOI: https://doi.org/10.1051/e3sconf/202341802003