For citations:
Smirnova O.V., Ovcharenko E.S., Kasparov E.V., Fefelova V.V. Reactivity of the autonomic nervous system in children of younger school age with mental retardation. Hygiene and Sanitation. 2023;102(2):169-174. (In Russ.) https://doi.org/10.47470/0016-9900-2023-102-2-169-174