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100   $a20030910d1987----km-y0itay50------ba
101 0 $aeng
102   $aGB
105   $ay-------001yy
200 1 $a<<The >>role of demand and supply in the generation and diffusion of technical change$fColin G. Thirtle, Vernon W.Ruttan
210   $aLondon$cHarwood Academic Publishers$d1987
215   $aVIII, 172 p.$d22 cm
225 1 $aFundamentals of pure and applied economics$v21
610 0 $aProgresso tecnico$aAspetti economici
676   $a338.064$v22$zita
700  1$aThirtle,$bColin G.$088977
701  1$aRuttan,$bVernon Wesley$f<1924- >$079830
801  0$aIT$bUNINA$gRICA$2UNIMARC
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996   $aRole of demand and supply in the generation and diffusion of technical change$91736247
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