Lichtenberg, Frank R.
The impact of R and D investment on productivity : New Evidence Using Linked R and D LRD Data .-- Cambridge (Mass.) : NBER , 1989
.--44 p. 24 cm .-- ( NBER. W.P.;2901 ).
Resumen. -- Bibliografía
INVESTIGACION CIENTIFICA
DESARROLLO TECNOLOGICO
The impact of R and D investment on productivity : New Evidence Using Linked R and D LRD Data .-- Cambridge (Mass.) : NBER , 1989
.--44 p. 24 cm .-- ( NBER. W.P.;2901 ).
Resumen. -- Bibliografía
INVESTIGACION CIENTIFICA
DESARROLLO TECNOLOGICO