New Study Calls for a Rethink of Cooperation in Biology Publications of Nanna Gertz All genres Thesis - PhD (1) Thesis - PhD (1) 1. Thesis - PhD Gertz, N.: Untersuchungen an Ceratopogoniden fließender Gewässer. Dissertation, Justus-Liebig-Universität, Gießen (1970) MPG.PuRe