21. W. D. Wallis: A beginner’s guide to graph theory Creator: Nebeský, Ladislav Format: bez média and svazek Type: model:article and TEXT Language: English Description: Autor recenze: Ladislav Nebeský Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
22. W. D. Wallis: Magic graphs Creator: Nebeský, Ladislav Format: bez média and svazek Type: model:article and TEXT Language: English Description: Autor recenze: Ladislav Nebeský Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public