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. The American Naturalist 171 (1) E44-E71. 10.1086/523952.