1. Píseň Creator: Koval, Karel Format: electronic Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2. Úřad Creator: Koval, Karel Format: electronic Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public