H. Nocheva, E. Encheva-Stoykova, G. Bogdanov, R. Tashev, and R. Nikolov, “The Endogenous Cannabinoid System and Nitric Oxide Interact in Modulation of Cold Stress-induced Analgesia”, C. R. Acad. Bulg. Sci., vol. 75, no. 11, pp. 1672–1679, Nov. 2022.