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Braun, T.; Glanzel, W.; Grupp, H.: ¬The scientometric weight of 50 nations in 27 scientific areas, 1989-1993 : Pt.1: All fields combined, mathematics, engineering, chemistry and physics (1995)
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Snyder, H.; Bonzi, S.: Patterns of self-citation across disciplines : 1980-1989 (1998)
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Száva-Kováts, E.: Indirect-collective referencing (ICR) : life course, nature, and importance of a special kind of science referencing (1999)
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