@article {1510649,
	title = {Double-Spend Counterattacks: Threat of Retaliation in Proof-of-Work Systems},
	journal = {CoRR abs/2002.10736 },
	year = {2020},
	url = {https://arxiv.org/pdf/2002.10736.pdf},
	author = {Daniel J. Moroz and Daniel J. Aronoff and Neha Narula and David C. Parkes}
}
