Hare, Donovan R2010-04-202010-04-2019912010-04-20http://hdl.handle.net/1828/2624It is shown that the block-intersection graph of pairwise balance design with (lambda)=1 has cycles of all possible lengths given that its minimum block size is at least 3.entechnical reports (mathematics and statistics)Cycles in the block-intersection graph of pairwise balanced designsTechnical ReportDepartment of Mathematics and Statistics