1. Postglasiale skoggrenser i sentrale sørnorske fjelltrakter;Aas;Norsk Geografisk Tisdskrift,1988
2. The present and the Holocene subalpine birch belt in Norway;Aas;Paläoklimaforchung/Palaeoclimate Research,1996
3. Alexandersson, H., Karlström, C., Larsson-McCann, S., 1991. Temperature and precipitation in Sweden, 196–90. Reference normals. Swedish Meteorological and Hydrological Institute. Meteorologi 81, Norrköping.
4. Holocene climatic instability: A prominent, widespread event 8200 yr ago;Alley;Geology,1997
5. Holocene tree-line dynamics and inferred climatic changes in the Abisko area, northern Sweden, based on macrofossil and pollen records;Barnekow;The Holocene,1999