1. Completion and extension of the periodic table of elements beyond uranium;Guillaumont, R.;C. R. Acad. Sci. Phys.,2019
2. Remarques à propos de la découverte du gallium;Mendeleev, M. D.;C. R. Hebd. séances Acad. Sci.,1875
3. [3] (Internet : Iypt2019.org)
4. [4] Adloff, J. P.; Guillaumont, R. Fundamental of Radiochemistry, CRC Press, 1993
5. On the discovery of artificial radioactivity;Guillaumont, Robert;Radiochim. Acta,1995