HACKMAN, V. Nya iakttagelser angående Yoldia-hafvets utbredning i Finland. Fennia - International Journal of Geography, [S. l.], v. 14, n. 1, p. 1–20, 1899. Disponível em: https://fennia.journal.fi/article/view/157276. Acesso em: 1 apr. 2025.