BONSDORFF, A. L’Etat-major Russe, Points astronomiques en Finlande. Fennia - International Journal of Geography, [S. l.], v. 1, n. 1, p. 1–11, 1889. Disponível em: https://fennia.journal.fi/article/view/155709. Acesso em: 19 jan. 2025.