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- The gordian knot : proceedings of a symposium held 21-22 January 1994 in Oslo, Norway / edit. Arnold Berstad, Knut Nygaard, Hermod Petersen . 1995. Vol. 30, Suppl. 211 - Oslo : Scandinavian University Press , 1995 - 43 s. (Scandinavian Journal of Gastroenterology; Suppl. 211) [1, currently available 0, at library only 1]
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