1、
Braun, Juan (1993). Essays on Economic Growth and Migration, Ph.D.dissertarion, Harvard University
2、
Dolado, Juan, Alessandra Goria, and Andrea Ichino (1993). "Immigration, Human Capital, and Growth in the Host Country: Evidence from Pooled Country Data,"
http://www.springerlink.com/content/h72l41624w26j147/