@Article{DeSimoneNavaraPtak:VHS,
  IS = { zkontrolovano 23 Apr 2003 },
  UPDATE  = { 2002-12-12 },
  author =      {De~Simone, Anna and Navara, Mirko and Pt{\'a}k, Pavel},
  title =       {The {V}itali--{H}ahn--{S}aks theorem for the product of 
                 quantum logics},
  authorship =  {33-34-33},
  journal =     {Demonstratio Mathematica},
  publisher =   {Warsaw Univ. Tech.},
  address =     {Warsaw, Poland},
  issn =        {0420-1213},
  year =        {2002},
  volume =      {35},
  pages =       {717--725},
  month =       {December},
  number =      {4},
  importance =  {1},
  project =     {MSM 212300013, GACR 201/00/0331},
  psurl       = {[Post Script]},
}