In many articles authors describe FMM for particles.
e.g.
http://www.csci.psu.edu/seminars/fallnotes/fmm.pdf
http://www.umiacs.umd.edu/labs/cvl/pirl/vikas/publications/FMM_tutorial.pdf
In other articles authors describe FMM for charged surface.
How does these formulations relates?
Main...