TY - BOOK
AU - Porat, Marc Uri
AU - United States. Dept. of Commerce. Office of Telecommunications
AU - National Science Foundation (U.S.)
TI - Definition and measurement
PB - U.S. Dept. of Commerce, Office of Telecommunications
PB - For sale by the Supt. of Docs., U.S. Govt. Print. Off.
PY - 1977
T2 - OT special publication
VL - 77-12(1) . The information economy
EP - xvi, 250 p.
UR - https://ci.nii.ac.jp/ncid/BA35714040
ER -
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