Postdoc at the
Dipartimento di Informatica e Sistemistica,
Università di Roma "La Sapienza", supported by Fellowships Programs n. 201.15.9,
201.15.11, and 201.15.13 of the Italian National Research Council
(CNR).
April 1997 - August 1998
Visiting Researcher at
the "Algorithms and Complexity Group" of the Max
Planck Institut fur Informatik of Saarbruecken (Germany),
supported by NATO - Advanced Fellowships Program n. 215.29 and by Fellowships
Program n. 203.15.07 of the Italian National Research Council (CNR).