Aperture-free star formation rate of SDSS star-forming galaxiesS. Duarte Puertas, J. M. Vilchez, J. Iglesias-Páramo, C. Kehrig, E. Pérez-Montero and F. F. Rosales-OrtegaA&A, 599 (2017) A71DOI: https://doi.org/10.1051/0004-6361/201629044