The Measurement of scientific and technological activities :
Freeman, Christopher.
The Measurement of scientific and technological activities : proposals for the collection of statistics on science and technology on an internationally uniform basis / by Christopher Freeman. - París : UNESCO, 1969. - 63 p. ; il., fot. - Statistical reports and studies ; 15. .
OC 31: 5.001.5 (100)=20 FRE No.15.
The Measurement of scientific and technological activities : proposals for the collection of statistics on science and technology on an internationally uniform basis / by Christopher Freeman. - París : UNESCO, 1969. - 63 p. ; il., fot. - Statistical reports and studies ; 15. .
OC 31: 5.001.5 (100)=20 FRE No.15.