References
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- Jacroux , M. 1980 . On the E-optimality of regular graph designs . J.R. Statist. Soc. B , 42 ( 2 ) : 205 – 209 .
- Raghavarao , D. and Chandrasekhararao , K. 1964 . Cubic designs . Ann. Math. Statist , 35 ( 2 ) : 389 – 397 .