ATHENS (Reuters) - A string of parliamentary resignations on Thursday threatened to thwart Greek Prime Minister George Papandreou's plan to reshuffle his cabinet and pass austerity measures needed to save the nation from default. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=7KePBXuWxBA:mLR_Srtq_YY:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=7KePBXuWxBA:mLR_Srtq_YY:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/7KePBXuWxBA)