### Author comment for 2000stdy.book.....C:

Pag.113 In eq. (10.8a) and in the proof, alpha>-1 instead of alpha>-1/2

Pag.113 In the integrand of eq. (10.8d) the exponent is alpha+3/2 instead of 3/2

Pag.148 The condition is not f_a < 0 "for all" Q_k, but "for some"

Author comment submitted on 16 June, 2009 by **luca ciotti** (luca.ciotti@unibo.it)