C. Shen, M. Yun, A. Arora, und H. Choi. CrownCom, Volume 291 von Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, Seite 112-125. Springer, (2019)
S. Parto, T. Ciarli, und S. Arora. Research Memoranda, 020. Maastricht : MERIT, Maastricht Economic Research Institute on Innovation
and Technology, (2005)