1. Classification and terminology of morainic landforms in Finland;Aario;Boreas,1977
2. Koijarven-Urjalan drumliinikenttä;Aartolahti;Terra,1966
3. Contribution to the physics of glaciers;Ahlmann;Geogr. J.,1935
4. The drumlins of southeastern Wisconsin;Alden;U.S. Geol. Surv. Bull.,1905
5. Radiation of glacial blow as a factor in drumlin formation;Alden;Bull. Geol. Soc. Am.,1911