Definition and measurement
Marc Uri Porat
(OT special publication, 77-12(1) . The information economy)
U.S. Dept. of Commerce, Office of Telecommunications , For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977
N111:878712596086
FG-US||401.5||U75-Te||77-12-140647750 "Prepared by the Office of Telecommunications with partial support of National Science Foundation" Includes bibliographical references
U.S. Dept. of Commerce, Office of Telecommunications , For sale by the Supt. of Docs., U.S. Govt. Print. Off
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