MATHEMATICAL MODEL FOR ASSESSING A SINGLE AUTONOMIC NERVOUS SYSTEM INDEX IN EXPRESS DIAGNOSTICS OF THYROID FUNCTION Article Kurnikova I., Zabrodina N., Sargar R., Yurovsky A., Aleksandrova M., Kniga V. Lecture Notes in Networks and Systems. Springer Science and Business Media Deutschland GmbH. Vol. 319. 2022. P. 1077-1081