The VLT-FLAMES survey of massive stars: Nitrogen abundances for Be-type stars in the Magellanic CloudsP. R. Dunstall, I. Brott, P. L. Dufton, D. J. Lennon, C. J. Evans, S. J. Smartt and I. HunterA&A, 536 (2011) A65DOI: https://doi.org/10.1051/0004-6361/201117588