https://www.aeaweb.org/articles?id=10.1257/0002828041464605

Jiang, K., W. Keller, L. D. Qiu, and W.Ridley (2018). “International Joint Ventures and Internal versus ExternalTechnology Transfer: Evidence from China,” NBER Working Paper No. 24455.

https://www.nber.org/papers/w24455

Keller, W., and S. Yeaple (2009).“Multinational Enterprises, International Trade, and Productivity Growth:Firm-level Evidence from the United States,” Review of Economics and Statistics91(4), 821–831.

https://www.mitpressjournals.org/doi/abs/10.1162/rest.91.4.821