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Submitted on: 29 January 2015.
Revised on: 26 February 2015.
Accepted on: 19 March 2015.
___________________COLD REGIONS SCIENCE AND TECHNOLOGY
Submitted on: 08 January 2016.
Revised on: 24 February 2016.
Accepted on: 25 March 2016.
___________________COLD REGIONS SCIENCE AND TECHNOLOGY