Boltayev Elmurod Bekmurod ugli and Sabirov Jo’raboy Marifbayevich (2021) “ORGANIZATION OF OXYGEN THERAPY USING A NASAL MASK AND VENTURA MASK IN SEVERE PATIENTS WITH COVID-19 CORONA VIRUS INFECTION”, Emergent: Journal of Educational Discoveries and Lifelong Learning (EJEDL) , 2(08), pp. 6–10. doi: 10.17605/OSF.IO/N26VB.