V. GRUBER, Otto. Photogrammetric equipment of the Graf Zeppelin on the arctic voyage of 1931 and methods of restitution of observational material obtained. The International Hydrographic Review, [S. l.], n. 1, 2018. Disponível em: https://journals.lib.unb.ca/index.php/ihr/article/view/28567. Acesso em: 20 may. 2025.