| http://www.w3.org/ns/prov#value | - Empirical studies began some thirty years ago, mainly in Germany, with the work of Siegfried Schmidt, Norbert Groeben, and their colleagues, but soon developed additional approaches, notably in Israel (Tsur), Holland (Andringa, van Peer), Canada (Hunt and Vipond, Cupchik, Bortolussi and Dixon, Miall and Kuiken), and the U.S.A. (Graesser, Martindale, Green).
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