Directed packing and covering designs with block size four

Ahmed M. Assaf, Nabil Shalaby, Jianxing Yin

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


In this paper we improve and generalize the results of two earlier papers of Skillicorn. The maximum (minimum) number of blocks in a directed (v, 4, λ) packing (covering) designs are completely determined.

Original languageEnglish
Pages (from-to)3-17
Number of pages15
JournalDiscrete Mathematics
Issue number1-3
StatePublished - Jul 28 2001
EventThe Third Shanghai Conference - Shanghai, China
Duration: May 15 1999May 19 1999


  • Directed
  • Maximum packing
  • Minimum covering


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