SCHOLZ, Volkard; SCHMERSAHL, Ralf. Biogas in PEM-Brennstoffzellen. agricultural engineering.eu, [S. l.], v. 60, n. 1, p. 12–13, 2005. DOI: 10.15150/lt.2005.1147. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2005-60-1-012-013. Acesso em: 4 mai. 2024.