INVESTIGATION OF PUMP-EJECTOR SYSTEMS CHARACTERISTICS FOR WATER ALTERNATING GAS INJECTION СтатьяDrozdov A.N., Karabaev S.D., Olmaskhanov N.Р., Gorbyleva Y.A., Narozhnyy I.M., Gorelkina E.I.Advances in Raw Material Industries for Sustainable Development Goals. 2021. С. 358-367