Analysis of publication activity of computational science society in 2001–2017 using topic modelling and graph theory - T. M. Abuhay; S. V. Kovalchuk; K. Bochenina; G.-K. Mbogo; A. A. Visheratin; G. Kampis; V. V. Krzhizhanovskaya; M. H. Lees (Journal of Computational Science, 2018)