Carvalho, Deysimar de Souza, Eduardo Winter, Cheila Gonçalves Mothé, and Tatiana Carestiato da Silva. 2011. “Technological Monitoring Applied to Survey-Based on Brazilian Patent Applications about PEMFC”. Journal of Technology Management & Innovation 6 (2). Santiago, Chile:145-60. https://doi.org/10.4067/S0718-27242011000200010.