Fertilitätsausschluß nach Vasektomie
      
        
      
    Fragen aus der Praxis
      Fertility computing device
      
        
      
    Patent 2.642.225
      Fertility Control
      
        
      
    Update and Trends
      Fertility indicator
      
        
      
    Patent 4.151.831
      Fertility period indicator
      
        
      
    Patent 2.769.593
      Fertility Regulation and the Public Health 
      
        
      
    Selected Papers of Christopher Tietze
      First World Congress on Fertility and Sterility