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ÓÄÓÄÀ¼¶ù: ½ð±Ò+10, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2013-09-26 19:52:12
¶«²ýÝ·: ½ð±Ò+5, PEPI+1 2013-09-27 08:23:09
It might be craze. Is the surface fractured ones?

Please refer to this paper:

http://www.sciencedirect.com/science/article/pii/0014305789901110

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