E.A., B., M.T., H., F.M., A., & A.B., S. (1990). Communal land use and the ’tragedy of the commons’: Some problems and development perspectives with specific reference to semi-arid regions of southern Africa. African Journal of Range and Forage Science, 7(2), 77–80. Retrieved from https://www.ajol.info/index.php/ajrfs/article/view/952