00499naa#a2200169#i#450# EN\\bibl\115489 20260320123900.5 2782-4586 20260131b2026####ek#y0engy0150####ca RU Practical application of graph theory in various sectors of economy Journal article Moscow ITBO University 2026 5 с. Journal article local Habarova Irina Andreevna Habarov Denis Andreevich jomeam.ru