Islom Khafizov, Komil Gafforov, and Bektosh Miyliyev. “ADVANTAGES OF USING A VARIABLE SPEED DRIVE IN PUMPING UNITS”. Emergent: Journal of Educational Discoveries and Lifelong Learning (EJEDL), vol. 2, no. 05, May 2021, pp. 131-42, doi:10.17605/OSF.IO/24GJU.