RAMSAY, W. Das Nephelinsyenitgebiet auf der Halbinsel Kola. Fennia - International Journal of Geography, [S. l.], v. 15, n. 1, p. 1–27, 1899. Disponível em: https://fennia.journal.fi/article/view/157287. Acesso em: 19 apr. 2025.