1. Neviditelní škůdcové Creator: ŠTEFL, Jiří Format: electronic Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2. Život a smrt Creator: ŠTEFL, Jiří Format: electronic Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public