00478naa#a2200169#i#450# EN\\bibl\37041 20240430132142.2 0131-6184 20200413b2020####ek#y0engy0150####ca RU STAGES OF VACUUM FISH-PUMP UNIT OPERATION Journal article Moscow FSBI "TSUREN" 2020 4 с. Journal article local Naumov Vladimir A. Velikanov Nikolay Leonidovich tsuren.editorum.ru