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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