[9]
The determinants of high-tech versus low-tech R&D investment:evidence from testing the pooling assumption .2 BECKER B,HALL S G. NIESR discussion papers . 2003
[9]
The determinants of high-tech versus low-tech R&D investment:evidence from testing the pooling assumption .2 BECKER B,HALL S G. NIESR discussion papers . 2003