A description of the boundary
behavior of functions belonging to certain Sobolev classes of holomorphic
functions on the unit ball Bn of Cn is given in terms of bounded and vanishing
mean oscillation. In particular, it is shown that the boundary values of any
holomorphic function on Bn, whose fractional derivative of order n∕p belongs
to the Hardy class Hp(Bn), have vanishing mean oscillation provided
0 < p ≤ 2.