%0 Journal Article %T Pairwise Balanced Design of Order and 2-Fold System of Order %A Manjusri Basu %A Debabrata Kumar Ghosh %A Satya Bagchi %J ISRN Discrete Mathematics %D 2012 %I Hindawi Publishing Corporation %R 10.5402/2012/251457 %U http://dx.doi.org/10.5402/2012/251457