Yermekkyzy Л. “DEFINITION OF HYDRAULIC RESISTANCE OF UNDERGROUND OIL PIPELINE”. Bulletin of Abai KazNPU. Series of Physical and Mathematical sciences 69, no. 1 (June 3, 2021): 56–61. Accessed May 8, 2026. https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/250.