search query: @author Schaefer, W. / total: 5
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4.
Readers per copy of trade publications.
European Research
1986 : VOL. 14:4, p. 198-201
 1986 Schaefer, W.
5.
On a code for media research.
European Research
1986 : VOL. 14:2, p. 82-84
 1986 Schaefer, W.
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