[Gretl-users] pooled probit - normality test

Dear list members, I have a question regarding the normality test that is printed out if one estimates a pooled probit model. The user guide says it is a conditional moment test on skewness and kurtosis (p.285). The next paragraph begins with "In this context $uhat...." and references to Gourieroux et al. (1987). I understand that the normality test is conducted using the generalized residuals. Is this test also presented in their paper? If not, would it be possible to provide a reference? Thanks in advance and best regards, Jan