Two improvements of a result concerning a problem of K. Zarankiewicz Š. Znám — 1964 Colloquium Mathematicae
Minimal size of a graph with diameter 2 and given maximal degree. II. Znám, Š. — 1992 Acta Mathematica Universitatis Comenianae. New Series
Maximal pentagonal packings. Černý, A.; Horák, P.; Rosa, A.; Znám, Š. — 1996 Acta Mathematica Universitatis Comenianae. New Series