multiple-scattering.md

 Some documentation to implement a Gaussian model for the multiple scattering.
 
-See formulas 7.55 - 7.56 :
+See formulas 27.10:
 
-http://geant4.cern.ch/G4UsersDocuments/UsersGuides/PhysicsReferenceManual/html/node34.html
+http://pdg.lbl.gov/2005/reviews/passagerpp.pdf
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