1. The structure and morphology of minerogenic palsas in northern Norway;Åhman;Biuletyn Peryglacjalny,1976
2. Palsas and mineral permafrost mounds in northern Quebec;Allard,1987
3. Pingo degradation in the Bayan-Nuurin-Khotnor Basin, Khangai Mountains, Mongolia;Babinski;Boreas,1982
4. The Periglaciation of Great Britain;Ballantyne,1994
5. Ramparted ground ice depressions in Britain and Ireland;Bryant,1987