Similar title to Pennings, P.S., Kopp, M., Meszena, G., Dieckmann, U. ORCID: https://orcid.org/0000-0001-7089-0393, & Hermisson, J. (2008). An Analytically Tractable Model for Competitive Speciation. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-08-046