On a problem of Chen and Grätzer. Düntsch, I. Algebra Universalis, 14(3):401, 1982. MR654407
bibtex   
@Article{id82a,
  author     = {D\"{u}ntsch, I.},
  journal    = {Algebra Universalis},
  title      = {On a problem of {C}hen and {G}r\"{a}tzer},
  year       = {1982},
  issn       = {0002-5240},
  note       = {MR654407},
  number     = {3},
  pages      = {401},
  volume     = {14},
  fjournal   = {Algebra Universalis},
  mrclass    = {06D05},
  mrnumber   = {654407},
  mrreviewer = {M. E. Adams},
}

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