Title of article :
Directed packing and covering designs with block size four Original Research Article
Author/Authors :
Ahmed M. Assaf، نويسنده , , Nabil Shalaby، نويسنده , , Jianxing Yin، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Abstract :
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.
Keywords :
Directed , Minimum covering , Maximum packing
Journal title :
Discrete Mathematics
Journal title :
Discrete Mathematics
