Studying chemical reactions in biological systems with MBN Explorer: implementation of molecular mechanics with dynamical topologyGennady B. Sushko, Ilia A. Solov’yov, Alexey V. Verkhovtsev, Sergey N. Volkov and Andrey V. Solov’yovEur. Phys. J. D, 70 1 (2016) 12DOI: https://doi.org/10.1140/epjd/e2015-60424-9