LITERATURE
- Brown , R. J. E. 1970 . Permafrost in Canada; its influence on Northern Development. University of Toronto Press . 234 p
- Embleton , C. and King , C. A. M. 1975 . Periglacial geomorphology. London : Edward Arnold . 203 p
- Ferrians , O. , Kachadoorian , R. and Green , G. W. 1969 . Permafrost and related engineering problems in Alaska. United States Geological Survey, Professional Paper, 678, 37
- French , H. M. 1976 . The Periglacial Environment. London : Longmann . 309 p
- Humlum , O. 1979 . Icing ridges: A sedimentary criterion for recognizing former occurrence of icings . Bull. geol. Soc.Denm. , 28 : 11 – 16 .
- Jahn , A. 1975 . Problems of the periglacial zone. PWN, Polisch Scientific Publishers, Warszawa.
- Karte , J. 1979 . Räumliche Abgrenzung und regionale Differentierung des Periglaziärs. Bochumer Geogr. Arb., 35, 211.
- Kozarski , S. 1975 . Oriented kettle holes in outwash plains . Quaestiones Geographicae , 2 : 99 – 112 .
- Liestøl , O. 1977 . Pingos, springs, and permafrost in Spitsbergen. . Norsk Polarinstitutt, Årbok , 1975 : 7 – 29 .
- Nekrasov , I. A. and Gordeyev , P. P. 1973 . The Northeast Yakutia. Guidebook, Sec. Int. Permafrost Conference, Yakutsk, 46.
- Svensson , H. 1973 . Isfält, »Naledi« i Cherskiybergen. Svensk Geografisk Årsbok, nr. 49, Lund 225 – 227 .
- Svensson , H. 1977 . En fossil dalform på Lahomsslätten . Svensk Geografisk Årsbok , 53 : 116 – 125 .
- Thomson , S. 1966 . Icings on the Alaska Highway. . I »Proceedings, 1st. International Permafrost Conference«, National Academy of Science, Nat. Res. Council of Canada, Pubi. , 1287 : 526 – 529 .
- Washburn , L. A. 1979 . Geocryology. London : Arnold . A survey of periglacial processes and environments. Edwards 406 p
- Åkerman , J. 1980 . Studies on periglacial geomorphology in West Spitsbergen. Meddl. Lund. Univ. Geogr. Inst., Avhandl. 89, 297.