TY  - BOOK
AU  - Trajtenberg Manuel
TI  - Economic analysis of product innovation:  The case   
T2  - Harvard Economics Studies , 160
SN  - 0674225406
U1  - X9(D6,8(L):511.73.N9, N0 
PY  - 1990///
CY  - Cambridge
PB  - Cambridge University Press        
KW  - Mechanical
N1  - Bibliography: P 227-32
ER  -