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@ARTICLE{,
    author = {C{\'{u}}th, Marek and Fabian, Marian},
     title = {Asplund spaces characterized by rich families and separable reduction of Fr{\'{e}}chet subdifferentiability},
   journal = {Journal of Functional Analysis},
    volume = {270},
    number = {4},
      year = {2016},
     pages = {1361–1378},
       doi = {10.1016/j.jfa.2015.12.005},
  abstract = {Asplund property of a Banach space X   is characterized by the existence of a rich family, in the product X×X⁎X×X⁎, consisting of some carefully chosen separable subspaces. This structural result is then used to add a lot of precision and simplicity to the known separable reductions of Fr{\'{e}}chet subdifferentials.}
}