SALMI, P.; TORKKELI, M. T. Inventions Utilizing Satellite Navigation Systems in the Railway Industry – An Analysis of Patenting Activity. Journal of Technology Management & Innovation, Santiago, Chile, v. 4, n. 3, p. 46–58, 2009. DOI: 10.4067/S0718-27242009000300005. Disponível em: https://www.jotmi.org/index.php/GT/article/view/art125. Acesso em: 20 apr. 2024.