used inbusinesslettersto refer to anearlierletter,conversation,meeting, etc.:
Further toyourletterof 11March, I should like toinformyou of anumberofrecentdevelopmentsregardingthe SaffronHillsite.
Further toourtelephoneconversationtoday, I havepleasureinenclosingacopyof thedocumentasdiscussed.
Further toourmeetingonMonday19June, I am writing to set outdetailsof theproposaldiscussed.
Further toourrecenttelephoneconversation, I amenclosingtherelevantdocumentsforyourinspection.
Further toyourcorrespondenceaboutrefusecollections, I would like tosharewithyourreadersasystemthatworksvery well in thispartof thecountry.