Joint moments of proper delay times
  We calculate negative moments of the $N$-dimensional Laguerre distribution for the orthogonal, unitary, and symplectic symmetries. These moments correspond to those of the proper delay times, which are needed to determine the statistical fluctuations of several transport properties through classically chaotic cavities, like quantum dots and microwave cavities with ideal coupling. 
Angel M. Mart\'inez-Arg\"uello, Mois\'es Mart\'inez-Mares, and Julio   C. Garc\'ia
cond-mat.mes-hall