Wolf-Rayet stars in the Small Magellanic Cloud - I. Analysis of the single WN starsR. Hainich, D. Pasemann, H. Todt, T. Shenar, A. Sander and W.-R. HamannA&A, 581 (2015) A21DOI: https://doi.org/10.1051/0004-6361/201526241