“…Despite certain shortcomings, objections and caveats (Seglen, 1997;Campbell, 2008;Reinstein et al, 2011), citations and citation-related indicators are regularly applied to assess the scientific impact of journals (Garfield, 1972), strengths of research groups (Schubert et al, 1989) and performance of individual scientists (Hirsch, 2005). Citations are also utilized together with other criteria to determine research priorities (Neff and Corley, 2009), allocate funding, and decide appointments, promotions and tenures (Reed, 1995;Ball, 2007). The main problem with using citations for evaluations is a large difference in the average number of citations received by papers in different research fields (Seglen, 1997;Iglesias and Pecharromán, 2007;Radicchi et al, 2008).…”