http://digfir-published.macmillanusa.com/chiangcoremicro3_quiz/chiangcoremicro3_quiz_ch5_1.htmlElasticity54ee47d7757a2e1128000000
http://digfir-published.macmillanusa.com/chiangcoremicro3_quiz/chiangcoremicro3_quiz_ch5_1_dlap.xmlDLAP questions54ee47d7757a2e1128000000