Reassessing Patent Propensity: Evidence from a Dataset of R&D Awards, 1977-2004
Roberto Fontana, Alessandro Nuvolari, Hiroshi Shimizu, Andrea Vezzulli
Research Policy, vol. 42, 2013, p. 1780-1792.

Schumpeterian Patterns of Innovation and the Sources of Breakthrough Inventions: Evidence from a Data-Set of R&D Awards
Roberto Fontana, Alessandro Nuvolari, Hiroshi Shimizu, Andrea Vezzulli
Journal Of Evolutionary Economics, vol. 22, 2012, p. 785-810.