No surface integrals!? (see eg http://en.wikipedia.org/wiki/Divergence_theorem http://en.wikipedia.org/wiki/Divergence_theorem, the one with the circle showing

No surface integrals!? (see eg http://en.wikipedia.org/wiki/Divergence_theorem http://en.wikipedia.org/wiki/Divergence_theorem, the one with the circle showing integral over the boundary surface, there's a triple version of that too).