Nykyforchyn, I.V. 2021. OPTIMAL CONTRACTS IN A MULTI-PURPOSE TASK: Array. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number. 1(59) (Jan. 2021), 66–71. DOI:https://doi.org/10.31471/2304-7399-2020-1(59)-66-71.