1. W.H. Clatworthy, Tables of two-associate class partially balanced designs, (U.S. Dept. of Commerce, NBS, Washington, 1973).
2. I.P. Goulden and R.G. Stanton, Cyclic generation of Steiner triple systems, (to appear).
3. Marshall Hall Jr., Combinatorial Theory (Blaisdell, Waltham, Mass., 1967).
4. Rev. Thomas Kirkman, On a problem in combinations, Cambridge and Dublin Math. J. 2 (1847), 191–204.
5. E. Hastings Moore, Concerning triple systems, Math. Ann. 43 (1893), 271–285.