Eck, N.J.P. van

similarity measure concept journal similarity measures number science bibliometric approach research information mapping information science author analysis index van eck network property technique american society paper field object result figure pearson correlation problem system co-occurrence waltman value example similarity measure bibliometric maps density bibliometric mapping association strength algorithm study function cluster fi eld correlation association cocitation methodology set-theoretic similarity measures distribution strength term map occurrence society topic scientometric technology prof.dr citation management co-citation table pearson american vosviewer cosine promotor mapping technique document phrase price strategy ci field corpus h-index ci fi eld co-occurrence data frequency structure equation set-theoretic