Шаждекеева, Н. ., & Чанпалова, . А. . (2020). SOLUTION OF THE DUAL PROBLEM BY THE BARANKIN-DORFMAN METHOD FOR THE FORMATION OF THE INVESTMENT PORTFOLIO. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences, 70(2), 130–134. https://doi.org/10.51889/2020-2.1728-7901.20