Scientometrics 2016;107:271-286. Epub 2016 Feb 9.
School of Management, University of Leicester, University Road, Leicester, LE1 7RH UK ; eHumanities Group, Royal Netherlands Academy of Arts and Sciences (NKVA), Joan Muyskenweg 25, 1096 CJ Amsterdam, The Netherlands ; Group of Researchers for Applications of Physics in Economy and Sociology (GRAPES), Rue de la Belle Jardiniere 483, 4031 Angleur, Belgium.