1. More balanced ternary designs with block size three;Billington;Discrete Math.,1982
2. Balanced n-ary designs: a combinatorial survey and some new results;Billington;Ars Combin.,1984
3. Some remarks on 2-designs S2(2, 3, ν);Bennett,1978
4. Every twofold triple system can be directed;Colbourn;J. Combin. Theory A,1983
5. The quiddity of the isomorphism classes of some balanced ternary designs: including some anomalies;Donovan;Ars Combin.,1984