New Symmetric (61,16,4) Designs Invariant Under the Dihedral Group of Order 10
Landjev, Ivan, Topalova, Svetlana (1998)
Serdica Mathematical Journal
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∗ This work has been partially supported by the Bulgarian NSF under Contract No. I-506/1995. In this note we construct five new symmetric 2-(61,16,4) designs invariant under the dihedral group of order 10. As a by-product we obtain 25 new residual 2-(45,12,4) designs. The automorphism groups of all new designs are computed.