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Oettler, Jan and Schmid, Volker S and Zankl, Niko and Rey, Olivier and Dress, Andreas and Heinze, Jürgen (2013) Fermat's principle of least time predicts refraction of ant trails at substrate borders. PloS one 8 (3), e59739.
Oettler, Jan (2008) Natural history, plastic traits and reproduction in ants. PhD, Universität Regensburg