Güth, Werner Max Planck Institute for Research on Collective Goods, Max Planck Society;
http://www.mdpi.com/2073-4336/9/2/22/pdf (Any fulltext)
Di Cagno, D., Galliera, A., Güth, W., & Panaccione, L. (2018). Intention-based sharing. Games, 9(2): 22.