Engel, Christoph Max Planck Institute for Research on Collective Goods, Max Planck Society;
https://link.springer.com/article/10.1007%2Fs11127-017-0473-5 (Any fulltext)
Engel, C., & Heine, K. (2017). The Dark Side of Price Cap Regulation. A Lab Experiment. Public Choice, 173(1-2), 217-240.