def to_most_recent_reference
      me = DeepClone.clone(self)
      me.disable_id_attribute
      @relations << DocumentRelation.new(type: "instance", identifier: nil, url: nil, bibitem: me)
      @abstract = []
      @dates = []
      @docidentifier.each(&:remove_date)
    end
def to_most_recent_reference
      me = DeepClone.clone(self)
      me.disable_id_attribute
      @relations << DocumentRelation.new(type: "instance", identifier: nil, url: nil, bibitem: me)
      @abstract = []
      @dates = []
      @docidentifier.each(&:remove_date)
    end
def to_most_recent_reference me = DeepClone . clone ( self ) me . disable_id_attribute @relations << DocumentRelation . new ( type : "instance" , identifier : nil , url : nil , bibitem : me ) @abstract = [ ] @dates = [ ] @docidentifier . each ( :remove_date ) end
convert ISO:yyyy reference to reference to most recent
 instance of reference, removing date-specific infomration:
 date of publication, abstracts. Make dated reference Instance relation
 of the redacated document
convert ISO : yyyy reference to reference to most recent instance of reference removing date - specific infomration : date of publication abstracts . Make dated reference Instance relation of the redacated document