Godovan, V.V., Matyushkina, M.V. and Vastyanov, R.S. 2014. Nootropic effects of bis(citrato)germanates (stannates) with different metals (Mg, Co) in their structure. Zaporozhye Medical Journal. 16, 5 (Oct. 2014). DOI:https://doi.org/10.14739/2310-1210.2014.5.28787.