1. T. B. Bayanova, Age of Reference Geological Complexes in the Kola Peninsula and the Duration of Magmatic Processes (Nauka, St. Petersburg, 2004) [in Russian].
2. I. V. Bel’kov, “Yttrium mineralization of amazonite pegmatites of the alkaline granites of the Kola Peninsula,” Problems of Geology and Mineralogy of the Kola Peninsula (AN SSSR, Moscow–Leningrad, 1958), vol. 1, pp. 126–139.
3. P. E. Burnard, The Noble Gases as Geochemical Tracers, (Springer, Heidelberg, 2013).
4. L. J. Gaber, K. A. Fo-land, and C. E. Corbato, “On the significance of argon release from biotite and amphibole during vacuum heating,” Geochim. Cosmochim. Acta 52, 2457–2465 (1988).
5. E. K. Gerling, Current State of Argon Dating and Its Application in Geology, (AN SSSR, Moscow, 1961) [in Russian].