The embodiment hypothesis
DW Jorgenson - The Journal of Political Economy, 1966
http://www.jstor.org/pss/1829196
Productive trends: capital and labor
Kendrick,John W.- Review of Economics and Statistics,1956.
http://www.jstor.org/pss/1925777
Some theoretical aspects of capital measurement
Kendrick,John W.- American Economic Review, 1961
http://www.jstor.org/pss/1914473