In directory nda_i are AMPL files for problems i.* 
where i= 2, 3, 4  from
 http://www.cs.cas.cz/ics/reports/v798-00.ps
converted to AMPL by Yu-Ju Kuo and 
Hans D. Mittelmann (mittelmann@asu.edu), 7/2001

The problems with multiple objectives can be solved as
minimax problems.

The files ex2.ps resp. ex3.ps give the results with NDA.