SHOUGH, Martin. Belgium in UFO Photographs, Volume 1 (1950-1988), FOTOCAT Report #7 by Vicente-Juan Ballester Olmos & Wim van Utrecht. Journal of Scientific Exploration, [S. l.], v. 32, n. 1, 2018. Disponível em: https://journalofscientificexploration.org/index.php/jse/article/view/1265. Acesso em: 28 apr. 2026.