11. Rüdiger Glaser: Klimageschichte Mitteleuropas Creator: Sokol, Jan Type: article, model:article, and TEXT Language: Czech Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
12. Zajatcovo dilema a problém černých pasažérů Creator: Sokol, Jan Type: article, model:article, and TEXT Language: Czech Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public