For citations:

Durnev V.G., Murin D.M., Sokolov V.A., Chalyy D.J. On Some Approaches to the Solution of the Problem «Useful Proof-of-work for Blockchains». Modeling and Analysis of Information Systems. 2018;25(4):402-410. (In Russ.) https://doi.org/10.18255/1818-1015-2018-4-402-410