1. PJSC “Vimpelcom”. Text : electronic // PJSC “Vimpelcom”: website – 2023. – URL: https://moskva.beeline.ru/about/about-beeline/disclosure/annual-reports/
2. Megafon PJSC. Text: electronic / / PJSC Megafon: website –2023. – URL: https://corp.megafon.ru/investoram/shareholder/(date of application: 20.05.2023).
3. MTS PJSC. Text : electronic // MTS PJSC: website.– 2023. – URL: https://kras.mts.ru/personal (date of application: 20.05.2023).
4. PJSC “Rostelecom”. Text: electronic / / PJSC “Rostelecom”: website –2023. – URL: https://www.company.rt.ru/(date of application: 20.05.2023).
5. Corporate returns and cash conversion cycles