Use of absorption spectra for identification of endometallofullerenes - N. E. Akhanova; D. V. Shchur; N. A. Havryliuk; M. T. Habdullin; N. S. Anikina; An. D. Zolotarenko; Ya. Krivushchenko; Ol. D. Zolotarenko; B. M. Horielov; E. Erlanuly; D. H. Batryshev (Chemistry, physics and technology of surface, 2020)