6th World Multidisciplinary Earth Sciences Symposium - WMESS 2020 : proceedings. 7-11 September 2020, Prague, Czech Republic. 1. vyd. Bristol : IOP Publishing, 2020. online. IOP Conference Series: Earth and Environmental Science, volume 609. Available on Internet: <https://iopscience.iop.org/issue/1755-1315/609/1> ISSN 1755-1307.