Aryaev, N. L., V. G. Marichereda, I. M. Shevchenko, T. Ya. Moskalenko, J. M. El Mezevgi, and N. V. Shevchenko. 2017. “Features of Premature Infants Immune System”. Journal of Education, Health and Sport 7 (5):647-53. https://apcz.umk.pl/JEHS/article/view/4562.