Use to mark an external hyperlink for which there may be a valid replacement or available archived version as being dead, but when the determination requires additional or extensive research. Preferable to outright removal of links when there is doubt about possible future usefulness. | Use to mark an external hyperlink for which there may be a valid replacement or available archived version as being dead, but when the determination requires additional or extensive research. Preferable to outright removal of links when there is doubt about possible future usefulness. |