González-Fernández, Marcos, Carmen González-Velasco, and José-Luis Fanjul-Suárez. “Corruption, the Shadow Economy and Innovation in Spanish Regions”. Panoeconomicus 67, no. 4 (March 25, 2018): 509–537. Accessed April 26, 2024. http://www.panoeconomicus.org/index.php/jorunal/article/view/461.