A Poisson integral representation is given by
where
is a spherical Bessel function
of the first kind.
A Poisson integral representation is given by
where
is a spherical Bessel function
of the first kind.
Weisstein, Eric W. "Poisson Integral Representation." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/PoissonIntegralRepresentation.html