http://chonggi7.tistory.com/46


http://jhrun.tistory.com/archive/20131004


http://codeflow.co.kr/question/846/%EC%95%A1%ED%8B%B0%EB%B2%84%ED%8B%B0%EB%A1%9C-%EB%B6%80%ED%84%B0-%EA%B2%B0%EA%B3%BC%EB%A5%BC-%EB%B0%9B%EA%B8%B0/



http://soaring-dylan.tistory.com/60


http://apmsoft.tistory.com/78   <<=== singleTop   singleTask  주의 carefull



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