1、Technical progress, capital formation, and economic growth
RM Solow - 1962 - The American Economic Review
http://www.jstor.org/stable/1910871

2、Total productivity and the quality of capital
ED Domar - The Journal of Political Economy, 1963
http://www.jstor.org/pss/1828443

3、Addressing the quality change issue in the consumer price index
Moulton, KE Moses - Brookings Papers on Economic Activity, 1997
http://www.jstor.org/pss/2534705