1. The premelting of ice and its environmental consequences
2. Y. Muto, K. Watanabe, M. Mizoguchi, T. Ishizaki, Proceedings of the Seventh International Conference on Permafrost, 1998, p. 783.
3. M. Kumai, CRREL Report, Vol. 79–28, 1979.
4. A TECHNIQUE FOR OBSERVING FREEZING FRONTS
5. R.D. Miller, Proceedings of the Third International Conference on Permafrost, 1978, p. 377.