![](/media/publication/image/36f6eddc164132aeb50d93bed4a16b1c_0883-7252-5.jpg)
Koning, P., Ridder, G. and Van Den Berg, GerardJ. (1995). Structural and frictional unemployment in an equilibrium search model with heterogeneous agents Journal of Applied Econometrics, 10(1 S):S133--S151.
Shuangze Liu (1995). The heteroskedastic linear regression model and the Hadamard product a note Journal of Econometrics.