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Hausman, J. Hall, B.H. and Z. Grliches (1984) ``Econometric Models for Count Data with an Application to the Patents-R&D Relationship'' Econometrica 52-4 909-938.

2

Mullahy, J. (1986) ``Specification and Testing of Some Modified Count Data Models'' Journal of Econometrics 33 341-365.

3

Cameron, A.C. and P.K. Trivedi (1986) ``Econometric Models Based on Count Data: Comparisons and Applications of Some Estimators'' Journal of Applied Econometrics 1 29-53.

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Gurmu, S. Rilstone, P. and S. Stern (1995) ``Semiparametric Estimation of Count Regression Models'' manuscript, Department of Economics, University of Virginia.

Econometric Methods for Panel Data