The Chermak-Delgado lattice of ZM-groups
  In this note we prove that the Chermak-Delgado lattice of a ZM-group is a chain of length $0$. A similar conclusion is obtained for all dihedral groups $D_{2m}$ with $m\neq 4$. 
Marius T\u{a}rn\u{a}uceanu
math.GR