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Everett M. Rogers
1981-06-06 Volume 9 • Issue 4 • 1981 • 149–158
Tapio Varis
1981-06-06 Volume 9 • Issue 4 • 1981 • 159–166
Yvan Lebrun
1981-06-06 Volume 9 • Issue 4 • 1981 • 167–175
1981-06-06 Volume 9 • Issue 4 • 1981 • 176–184
1981-06-06 Volume 9 • Issue 4 • 1981 • 185–185
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