"R\u00FCdiger Hors" . "Ettrich" . "Doc. RNDr. R\u00FCdiger Hors Ettrich, Ph.D." . "Doc. RNDr. R\u00FCdiger Horst Ettrich, Ph.D." . . "R\u00FCdiger" . "6326633" . "Prof. RNDr. R\u00FCdiger Horst Ettrich, Ph.D." . "R\u00FCdiger Horst" . "RNDr. R\u00FCdiger Ettrich, PhD." . "RNDr. R\u00FCdiger Ettrich, Ph.D." .