Salmi P, Torkkeli MT. Inventions Utilizing Satellite Navigation Systems in the Railway Industry – An Analysis of Patenting Activity. J.Technol. Manag. Innov. [Internet]. 2009 Oct. 2 [cited 2024 Apr. 19];4(3):46-58. Available from: https://www.jotmi.org/index.php/GT/article/view/art125