Citation: Eab. De Graaf, Some demographic aspects of Down syndrome in the Netherlands and their implications, DOWN SYNDROME BEHIND THE DYKES, 1998, pp. 11-28
Citation: Eab. De Graaf et M. De Graaf-posthumus, The future of Down syndrome: A plea for more and more real options, DOWN SYNDROME BEHIND THE DYKES, 1998, pp. 47-54