HASELHOFF, Eltjo; BOERMAN, Robert J.; BOBBINK, Jan-Willem. An Experimental Study for Reproduction of Biological Anomalies Reported in the Hoeven 1999 Crop Circle. Journal of Scientific Exploration, [S. l.], v. 28, n. 1, 2014. Disponível em: https://www.journalofscientificexploration.org/index.php/jse/article/view/701. Acesso em: 24 apr. 2026.