1. Hartman C. W. and Johnson P. R. Environmental Atlas of Alaska Univ. of Alaska Fairbanks Alaska 1978 pp. 20–21.
2. Huang S. L. and Wu M. C. “In‐Situ Displacement Analysis of Underground Opening in Permafrost Regions (II)—Time and Geometric Effects ” 2nd Generic Mineral Technology Center Mine Systems Design and Ground Control Workshop November 12–13 1984 Reno Nev. pp. 73–84.
3. Huang S. L. and Garbeil H. “In‐situ Displacement Analysis of Underground Opening in Permafrost Regions ” 1st Generic Mineral Technology Center Mine Systems Design and Ground Control Workshop Nov. 28–29 1983 Blacksburg Va. pp. 67–83.
4. Pettibone H. C. and Waddell G. “Stability of an Underground Room in Frozen Gold Bearing Strata ” 75th Annual Northivest Mining Assoc. Convention Dec. 5–6 1969 Spokane Wash.