Romanov, A., V. Sulimov, I. Oferkin, A. Sulimov, and E. Maslennikov. “Gradientless Parallel Geometry Optimization of Bi 3+ 5 Cluster and Its Luminescent Properties”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 13, no. 32, Sept. 2012, pp. 341-6, https://en.num-meth.ru/index.php/journal/article/view/528.