Karymsakov Қарымсақов У. Т., Karazhanova Каражанова Д.Д., and Iisova Иисова А.М. 2022. “Variation Methods in Solving Positional Problems”. Рroblems of Engineering and Professional Education 62 (3):45. https://doi.org/10.32523/2220-685X-2021-62-3-45.