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دليل المستخدم
Kayal، A. A.، و Waters، R. C. (1997). An Empirical Evaluation of the Technology Cycle Time Indicator as A Measure of the Pace of Technological Progress in the Superconductor Technology (رسالة دكتوراه غير منشورة). George Washington University، واشنطن. مسترجع من http://search.mandumah.com/Record/611368
Kayal، Aymen A.، و Robert Charles Waters. "An Empirical Evaluation of the Technology Cycle Time Indicator As A Measure of the Pace of Technological Progress in the Superconductor Technology" رسالة دكتوراه. George Washington University، واشنطن، 1997. مسترجع من http://search.mandumah.com/Record/611368