Answer to the comment of Chudnovsky: On the square-root time relaxation   in molecular nanomagnets
  Answer to the comment of E. Chudnovsky concerning the following papers:   (1) N.V. Prokof'ev, P.C.E. Stamp, Phys. Rev. Lett.80, 5794 (1998).   (2) W. Wernsdorfer, T. Ohm, C. Sangregorio, R. Sessoli, D. Mailly, C. Paulsen, Phys. Rev. Lett. 82, 3903 (1999). 
W. Wernsdorfer, C. Paulsen, R. Sessoli