Algebra Colloquium Vol. 27, no. 1. Special Issue of G2R2 conference : Akademgorodok, Novosibirsk, Russia, August 06-19, 2018. 1. vyd. Singapore : World Scientific Publishing, 2020. 360 s. Available on Internet: <https://www.worldscientific.com/toc/ac/27/01> ISSN 1005-3867.