Liu, Yuxian; Rousseau, Ronald; Guns, Raf - In: Journal of Informetrics 7 (2013) 3, pp. 651-664
Collaboration can be described using layered systems such as the article–author–institute–country structure. These structures can be considered ‘cascades’ or ‘chains’ of bipartite networks. We introduce a framework for characterizing and studying the intensity of collaboration...