1. Aalto, M. , Donner, J. , Hirvas, H. & Niemelä, J. 1989: An interglacial beaver dam deposit at Vimpeli, Ostrobothnia, Finland. Geological Survey of Finland, Bulletin 348, 34 pp.
2. Aalto, M. , Donner, J. , Niemelä, J. & Tynni, R. 1983: An eroded interglacial deposit at Vimpeli, South Bothnia, Finland. Geological Survey of Finland, Bulletin 324, 37 pp.
3. Kieselgur in fluvioglazialen Ablagerungen in Haapajärvi in Ostbottnien;Aario;Bulletin de la Commission géologique de Finlande,1966
4. Discharge of ancient River Hinkua, Finland;Aario;Terra,1966