ARYAEV, N. L., MARICHEREDA, V. G., SHEVCHENKO, I. M., MOSKALENKO, T. Ya., EL MEZEVGI, J. M. and SHEVCHENKO, N. V. Features of premature infants immune system. Journal of Education, Health and Sport. Online. 31 May 2017. Vol. 7, no. 5, pp. 647-653. [Accessed 9 January 2025].