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3. T. N. Oniani, Integrative Functions of the Limbic System [in Russian], Metsniereba, Tbilisi (1980).
4. V. Petkova and K. Karadzhev, “Clinical picture and diagnosis of manganese-induced parkinsonism,” Gig. Truda, No. 4, 16–18 (1991).
5. I. V. Khavezov, Atomic Absorption Analysis [in Russian], Khimiya, Leningrad (1983).