Tristão, H. M., P. C. Oprime, D. Jugend, and S. L. . da Silva. “Innovation in Industrial Clusters: A Survey of Footwear Companies in Brazil”. Journal of Technology Management &Amp; Innovation, vol. 8, no. 3, Sept. 2013, pp. 45-56, doi:10.4067/S0718-27242013000400005.