Romero, D., Delgado, M.J., Alvarez, I. and De Lucas, S. (2014): “Assesment of the public tools used to promote R&D investment in Spanish SMEs”. Small Business Economics, 43(4), 959-976. DOI: 10.1007/s11187-014-9575-3
Romero, D., Sanz, J.F. and Álvarez, I. (2009): “Further considerations on the link between adjustment costs and the productivity of R&D investment: evidence for Spain”. Applied Economics Letters, 16, 1471-1476.