A Family of Group Divisible Designs of Block Size Four and Three Groups With l1=2 and l2=1 Using MOLS. - Devin Henson; Dinesh G. Sarvate (Ars Comb., 2006)

Group divisible designs with three groups and block size four. - Devin Henson; Dinesh G. Sarvate; Spencer P. Hurd (Discret. Math., 2007)