RETRACTED: Impact of entrance angle of rectangular openings of centrifugal multivortex device on its classification efficiencyArslan Muginov, Oksana Popkova, Maksim Antonov, Lenura Voronina and Maxim KuznetsovE3S Web Conf., 549 (2024) 01010DOI: https://doi.org/10.1051/e3sconf/202454901010