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[Fra82] Peter Frankl. An Extremal Problem for two Families of Sets. European Journal of Combinatorics 3(2):125-127. Elsevier, juin 1982. 
@article{ejc3(2)-Fra,
  author =              {Frankl, Peter},
  title =               {An~Extremal Problem for two Families of Sets},
  publisher =           {Elsevier},
  journal =             {European Journal of Combinatorics},
  volume =              {3},
  number =              {2},
  pages =               {125-127},
  year =                {1982},
  month =               jun,
  doi =                 {10.1016/S0195-6698(82)80025-5},
}
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