2GANDAHL R.Some aspects of the design of roads with boards of plastic foam[C]//Proceedings of the 3rd International Conference on Permafrost.Edmonton:National Research Council of Canada,1978:792-797.
3JOHNSON G H.Performance of an insulated roadway on permafrost[C] //Proceedings of the 4th International Conference on Permafrost.Washington:National Academy Press,1983:548-553.
