TY JOUR TI Condition Forecasting of Underground Main Pipelines in Permafrost Regions KW pipeline KW permafrost KW thawing areole KW pipeline subsidence KW deformation zone KW swag KW stress-strain state KW operation safety insuring KW structural strength. JO Safety in Technosphere AU Kotlyarevskiy, V.. PY 2013 IS 2 PB INFRA-M Academic Publishing LLC.