Distance-regular digraphs of girth 4

@article{Enomoto1987DistanceregularDO,
  title={Distance-regular digraphs of girth 4},
  author={Hikoe Enomoto and R. A. Mena},
  journal={J. Comb. Theory, Ser. B},
  year={1987},
  volume={43},
  pages={293-302}
}
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