TY  - BOOK
AU  - Heertje Arnold
AU  -  Perlman Mark
TI  - Evolving technology and market structure:  Studies in Schumpeterian economics   
U1  - XxM83:g, N0 
PY  - 1990///
CY  - Ann Arbor 
PB  - University of Michigan Press      
N1  - Bibliography chapterwise
ER  -