"Inverse scattering, resonances and functional determinants", Regensburg, March 21 - 24, 2004.
       pdf ,   ps.
   
      "Weak Weyl's law for congruence subgroups" (joint work with J.-P. Labesse),  Montreal, May 3 - 8, 2004.
         pdf ,   ps ,   dvi
      
     "Harmonic analysis on locally symmetric spaces and number theory", Jena, April 24, 2008.  pdf

   "The Arthur trace formula and spectral theory on locally symmetric space",  Banff, May 19, 2008, pdf