@misc{1169716,
  author = {W S Connor},
  title = {Some relations among the blocks of symmetrical group divisible designs:},
  year = {1952},
  month = {1952-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.1602},
  language = {en},
}