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Engel Konrad; Gronau Hans-Dietrich O. F.: An Erdős-Ko-Rado type theorem II. In: Acta cybernetica, (7) 4. pp. 405-411. (1986)
Gronau Hans-Dietrich O. F.; Proske Chr.: Maximal families of restricted subsets of a finite set. In: Acta cybernetica, (5) 4. pp. 441-451. (1982)
Gronau Hans-Dietrich O. F.: On Sperner families in which no 3 sets have an empty intersection. In: Acta cybernetica, (4) 2. pp. 213-220. (1979)
Gronau Hans-Dietrich O. F.: Recognition of monotone functions. In: Acta cybernetica, (4) 3. pp. 279-281. (1979)