Godovan, V. V., M. V. Matyushkina, and R. S. Vastyanov. 2014. “Nootropic Effects of bis(citrato)germanates (stannates) With Different Metals (Mg, Co) in Their Structure”. Zaporozhye Medical Journal 16 (5). https://doi.org/10.14739/2310-1210.2014.5.28787.