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*2. [http://magazine.fujitsu.com/us/vol38-1/paper14.pdf thermal cycling of lead free solder joints]
*3. [http://circuitsassembly.com/pdf/0206/0206nemi.pdf thermal cycling of lead free solder joints (2)]
*4. [http://www.ptli.com/testlopedia/tests/UL_thermal_index_746B.asp termal index of materials]
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