Poberezhnyi, V.I. et al. 2018. Fundamentals of the modern theory of the phenomenon of “pain” in terms of a systematic approach to issues its psychological component. Terminology of the systemic approach and a brief representation of the human body as a system. Pain medicine. 3, 2 (Aug. 2018), 6–23. DOI:https://doi.org/10.31636/pmjua.v3i2.97.