1. Bose, R.C.: Strongly regular graphs, partial geometries and partially balanced designs. Pac. J. Math. 13(2), 389–419 (1963)
2. Breach, D.R., Street, A.P.: Partitioning of quadruples into designs II. J. Combin. Math. Combin. Comput. 3, 41–48 (1988)
3. Brouwer, A.E., Ivanov, A.V., Klin, M.H.: Some new strongly regular graphs. Combinatorica 9, 339–344 (1989)
4. Cameron, P.J., Praeger, C.E.: Partitioning into Steiner systems. In: Barlotti, A., et al. (eds.) Combinatorics ’88, pp. 61–71. Mediterranean Press, Roma (1992)
5. Cohen, A.M.: A new partial geometry with parameters $$(s, t, \alpha ) = (7, 8, 4)$$. J. Geom. 16, 181–186 (1981)