@INPROCEEDINGS{PtakQS98,
  AUTHOR =   {Pt{\'a}k, P.},
  EDITOR =   {A. Dvure{\v c}enskij, F. Chovanec, S. Pulmannov\'a
                  and E. Ryb\'arikov\'a},
  TITLE =   {Concrete quantum logics},
  BOOKTITLE =   {Proc. Quantum Structures '98},
  NOTE =   {Submitted},
  WHO =     {Navara},
}