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  1. Levitt, J.M.; Thelwall, M.: Is multidisciplinary research more highly cited? : a macrolevel study (2008) 10.09 
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  2. Levitt, J.M.; Thelwall, M.: Citation levels and collaboration within library and information science (2009) 10.09 
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  3. Levitt, J.M.; Thelwall, M.; Oppenheim, C.: Variations between subjects in the extent to which the social sciences have become more interdisciplinary (2011) 10.09 
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  4. Thelwall, M.; Levitt, J.M.: National scientific performance evolution patterns : retrenchment, successful expansion, or overextension (2018) 10.09 
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