Counting frequencies of configurations in Steiner Triple Systems

@article{Hork1997CountingFO,
  title={Counting frequencies of configurations in Steiner Triple Systems},
  author={Peter Hor{\'a}k and Nicholas C. K. Phillips and Walter D. Wallis and Joseph L. Yucas},
  journal={Ars Comb.},
  year={1997},
  volume={46}
}