Romero Jordán (Universidad Rey Juan Carlos) D, Delgado Rodríguez (Universidad Rey Juan Carlos) MJ, Álvarez Ayuso (Universidad Autónoma de Madrid) I. R&D and productivity in the spanish´s manufacturing firms. ReE [Internet]. 2010 Jun. 25 [cited 2026 Apr. 26];(2). Available from: https://revistaselectronicas.ujaen.es/index.php/REE/article/view/352