Pammolli, Fabio and Fu, Dongfeng and Buldyrev, Sergey V. and Riccaboni, Massimo and Matia, Kaushik and Yamasaki, Kazuko and Stanley, H. Eugene A generalized preferential attachment model for business firms growth rates: I. Empirical evidence. The European Physical Journal B, 57 (2). pp. 127-130. ISSN 1434-6028 (2007)