1. Savelyeva GM. Intranatal care of the fetus. Controversial and unsolved issues. Gynecology, Obstetrics and Perinatology. 2004;3(4):7-11. (In Russ).
2. Baibarina EN, Degtyarev DN. Transition to new rules for baby's birth registration in accordance with the criteria recommended by the world health organization: historical, medico-economic, and organizational aspects. Rossiyskiy Vestnik Perinatologii i Pediatrii = Russian Bulletin of Perinatology and Pediatrics. 2011;56(6):6-9. (In Russ).
3. Baybarina YN, Sorokina ZK. Outcomes of 22-27 weeks of pregnancy in health care institutions of Russian Federation. Voprosy sovremennoi pediatrii — Current Pediatrics. 2011;10(1):17-20. (In Russ).
4. Zav'yalov OV, Ignatko IV, Pasechnik IN, Babaev BD. Pervoe desyatiletie otechestvennoi “perinatal'noi revolyutsii”: istoricheskaya rol' i kliniko-epidemiologicheskie aspekty zabolevaemosti glubokonedonoshennykh novorozhdennykh. Pediatriya Sankt-Peterburga: opyt, innovatsii, dostizheniya. Zdorov'e i obraz zhizni uchashchikhsya v sovremennykh usloviyakh: vzglyad vracha i pedagoga: Collection of materials of the XIV All-Russian Forum and the XIV All-Russian Scientific and Practical Conference. St. Petersburg; 2022. pp. 99-104. (In Russ).
5. Strizhakov AN, Davydov AI, Ignatko IV, et al. High-technological methods of examining the mother and the fetus: healthcare of a future generation. Gynecology, Obstetrics and Perinatology. 2012;11(4):6-12. (In Russ).