//-->
Testing for selectivity bias in panel data models
Verbeek, Marno, (1990)
Instrumental variables estimation of a nearly nonstationary, heterogenous error component model
Choi, In, (2002)
Dynamic panel estimation and homogeneity testing under cross section dependence
Phillips, Peter C. B., (2002)
Diagnostic tests of cross section independence for nonlinear panel data models
Hsiao, Cheng, (2007)