Moscoso Zea, Oswaldo, Dominik Lekse, Andrew Smith, and Lars Holstein. 2012. “Understanding the Current State of the NFC Payment Ecosystem: A Graphbased Analysis of Market Players and Their Relations”. Enfoque UTE 3 (2):pp. 13 - 32. https://doi.org/10.29019/enfoqueute.v3n2.2.