On the Mechanism of Hawking Radiation
  In this paper we derived Hawking radiation as a tuneling of massless particles through a non-singular horizon in the s-wave approximation. The back reaction of emitted modes on the background black hole geometry is self-consistently taken into account. This is arXive copy of the paper published in the Russian journal "Gravitation and Cosmology" in 1999. 
V.A. Berezin, A. Boyarsky and A.Yu. Neronov