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In this paper we introduce a construction of directed strongly regular graphsfrom smaller ones using equitable partitions. Each equitable partition of asingle DSRG satisfying several conditions leads to an infinite family ofdirected strongly regular graphs. We construct in this way dozens of infinitefamilies. For order at most 110, we confirm the existence of DSRGs for 30previously open parameter sets.

New infinite families of directed strongly regular graphs via equitable partitions