Rigidity versus flexibility for tight confoliations, Geometry and Topology 15 (2011) No. 1, 41-121 (journal)
Uniqueness of the contact structure approximating a foliation, Geometry and Topology 20 (2016), no.5, p. 2439-2573. (journal) Here is a version of this preprint with fewer typos and slightly more details (the mathematical content is the same as in the arxiv-version).
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.
Non-loose unknots, overtwisted discs and the contact mapping class group of S3, (pdf) , https://arxiv.org/abs/1612.06557. Accepted for publication by GAFA.
mit A. del Pino, The Engel-Lutz twist and overtwisted Engel structures, (pdf) https://arXiv:1712.09286,