Similar title to Lutz, W. ORCID: https://orcid.org/0000-0001-7975-8145 & Scherbov, S. ORCID: https://orcid.org/0000-0002-0881-1073 (1999). Quantifying Vicious Circle Dynamics: The PEDA Model for Population, Environment, Development and Agriculture in African Countries. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-99-049