M-theory on G_2 manifolds and the method of (p,q) brane webs
Acknowledgments
A.BelhajwouldliketothankDepartmentofMathematicsandStatistics,ConcordiaUniver-sity,Montreal,foritskindhospitalityduringthepreparationofthiswork.HeisverygratefultoJ.McKayfortheinvitation,discussionsandencouragement.HewouldliketothankJ.Rasmussenforcommentsonthemanuscript,andH.Kisilevsky,E.H.SaidiandA.Sebbarfordiscussionsandscienti chelp.
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