1. Glossary of permafrost and related ground ice terms;ACGR,1988
2. Geological conditions for the burial of Pleistocene glacier ice on the Yenisey;Astakhov;Polar Geography and Geology,1986
3. Glacières and Freezing Caverns;Balch,1900
4. Circum-Arctic Map of Permafrost and Ground-Ice Conditions;Brown,1997
5. Digital Circum-Arctic map of permafrost and ground-ice conditions;Brown,1997