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Barge-Gil, Andrés and López, Alberto (2011): R versus D: Estimating the differentiated effect of research and development on innovation results. Unpublished.
Vásquez Urriago, Ángela Rocio; Barge-Gil, Andrés; Modrego Rico, Aurelia and Paraskevopoulou, Evita (2011): The impact of science and technology parks on firms´ product innovation: empirical evidence from Spain. Unpublished.