See: http://www.archeologickyatlas.cz/en/lokace/jistebsko_jn_tezebni_areal Václav Kachlík, Geological setting, petrology and mineralogy of metabasites in a thermal aureole of Tanvald granite (northern Bohemia) used for the manufacture of Neolithic tools, Journal of GEOsciences 4 (2009), 269–287
