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mit D. Kotschick Engel structures and weakly hyperbolic flows on four-manifolds, (pdf) , https://arxiv.org/abs/1610.04001. Accepted for publication by Comm. Math. Helv.
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mit A. del Pino, The Engel-Lutz twist and overtwisted Engel structures, (pdf) https://arXiv:1712.09286