Aperture-free star formation rate of SDSS star-forming galaxies S. Duarte Puertas, J. M. Vilchez, J. Iglesias-Páramo, C. Kehrig, E. Pérez-Montero and F. F. Rosales-Ortega A&A, 599 (2017) A71 Published online: 02 March 2017 DOI: 10.1051/0004-6361/201629044