New issues of a continuing resource have ceased to be published or that a change in author or title has caused a successive entry record to be created. When a new title supersedes a previously existing one, the earlier title is considered dead and coded d in field 008/06. An item is considered to have ceased publication only when there is clear evidence that it has. Generally, a period of more than three years during which no new issue of a continuing resource has been published is considered evidence that it has ceased publication.