||D. A. B. Miller, "Communicating with Waves Between
Volumes -- How Many Different Spatial Channels Are There?" in Optics in Computing
'98, Pierre Chavel, David A. B. Miller, Hugo Thienpont, Editors, (Optics in Computing
'98 Conference, Brugge, Belgium (June 17-20, 1998)) Proc. SPIE Vol. 3490, 111-114 (1998).
show how to calculate exactly the number and strength of the connections between two
arbitrary volumes, and derive and apply a novel sum rule.
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