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In a study of Swedish news media, 1912-84, a distinction is made between news values, regarded as more or less permanent, and changing news ideologies, conceived as an outflow of other ideologies. In statements concerning the broadcasting media three periods of different news ideologies are identified. They all seem to have had a strong impact both on the selection of news and on the selection of perspectives applied in the news.
Westerståhl et al. (Sun,) studied this question.
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