The Ehrenfeucht-Silberger Problem. Holub, Š. & Nowotka, D. J. Comb. Theory, Ser. A, 119(3):668 - 682, 2012.
The Ehrenfeucht-Silberger Problem [link]Paper  doi  bibtex   
@Article{HolubNowotka12,
  author   = {Holub, {\v{S}}t{\v{e}}p{\'a}n and Nowotka, Dirk},
  title    = {The {E}hrenfeucht-{S}ilberger Problem},
  journal  = {J. Comb. Theory, Ser. A},
  year     = {2012},
  volume   = {119},
  number   = {3},
  pages    = {668 - 682},
  issn     = {0097-3165},
  doi      = {10.1016/j.jcta.2011.11.004},
  fjournal = {Journal of Combinatorial Theory, Series A},
  url      = {http://dx.doi.org/10.1016/j.jcta.2011.11.004},
}

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