8Choi, I. , Unit Root Tests for Panel Data. Journal of International Money and Finance, 20(2), 2001, pp. 249-272.
9Coulson, N. E. , and Kim, M. S. , Residential Investment, Non-residential Investment and GDP. Real Estate Economics, 28 (2), 2000, pp. 233-247.
10Green, R. K. , Follow the Leader: How Changes in Residential and Non-Residential Investment Predict Changes in GDP. Real Estate Economics, 25(2), 1997, pp. 253-270.
