TY  - JOUR
TI  - Econometric Models for Count Data with an Application to the Patents-R & D Relationship
AU  - Jerry A. Hausman
AU  - Bronwyn H. Hall
AU  - Zvi Griliches
JO  - Econometrica
PY  - 1984
VL  - 52
IS  - 4
DO  - 10.2307/1911191
UR  - https://doi.org/10.2307/1911191
ER  -