@article{MAIS_2019_26_2_a4,
     author = {D. M. Murin and V. N. Knyazev},
     title = {On the issue of using {``Useful''} tasks for proof of works in blockchain},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {244--255},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2019_26_2_a4/}
}