J. Rötzmeier-Keuper, J. Hendricks, N. Wünderlich, and G. Schmitz, “Triadic relationships in the context of services for animal companions,” Journal of Business Research, no. 85, pp. 295--303, 2018.

R. Hillmann and M. Trier, “Dissemination Patterns and Associated Network Effects of Sentiments in Social Networks,” in Proceedings of the 2012 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, 2012, pp. 510–515.