RETRACTED: Assessment of hydraulic friction in polypropylene pipesAybek Arifjanov, Dinislom Atakulov, Sayfiddin Parpiyev, Zaytuna Ibragimova and Bekzod MakhmudovE3S Web Conf., 538 (2024) 01025DOI: https://doi.org/10.1051/e3sconf/202453801025