OKAMOTO, Toru. Fossil Periglacial Phenomena on Karst in the late Quaternary in the Akka Karst, Northeastern Japan. Geografia Fisica e Dinamica Quaternaria, [S. l.], v. 3, n. 4, p. 61–67, 1998. Disponível em: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1196.. Acesso em: 29 apr. 2026.