@book{ BA35714040,
 author = "Porat, Marc Uri and United States. Dept. of Commerce. Office of Telecommunications and National Science Foundation (U.S.)",
 title = "Definition and measurement",
 publisher = "U.S. Dept. of Commerce, Office of Telecommunications,For sale by the Supt. of Docs., U.S. Govt. Print. Off.",
 year = "1977",
 series = "OT special publication",
 number = "77-12(1) . The information economy",
 URL = "https://ci.nii.ac.jp/ncid/BA35714040"
}
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