A criterion for a certain class of integral operators to belong to Sch
atten-von Neumann synmetric normed ideals is given. In particular, whe
n 2 less than or equal to p < infinity, it is shown that the Schatten
p-norm of such an operator can be estimated by constant multiples of a
n integral expression which is a natural extension of the well-known f
ormula for the Hilbert-Schmidt norm. (C) 1995 Academic Press, Inc.