“…These include the arithmetic counting method (Van Hooydonk, 1997), in which credits are linearly distributed in decreasing order among the authors, the geometric counting method (Egghe et al, 2000), in which each author always gets twice the credits of the following author, the harmonic counting method (Hagen, 2008;Sekercioglu, 2008), in which the i-th ranked author receives 1{i of the credit received by the first author, and the axiomatic counting method (Stallings et al, 2013), which is conceptually the most similar to that proposed in the present paper. Other counting methods and procedures have been proposed (Abramo et al, 2013;Assimakis and Adam, 2010;Kim and Diesner, 2014;Liu and Fang, 2012;Lukovits and Vinkler, 1995;Trueba and Guerrero, 2004). All these methods are based on some intuitively correct argument, which makes it difficult to compare them or to claim that one method is superior to the others (Kim and Kim, 2015;Xu et al, 2016).…”