Asymmetric emission of the [OIII]λ5007 profile in narrow-line Seyfert 1 galaxies E. O. Schmidt, G. A. Oio, D. Ferreiro, L. Vega and W. Weidmann A&A, 615 (2018) A13 Published online: 06 July 2018 DOI: 10.1051/0004-6361/201731557