Our approach to intertextuality begins from the time-tested technique of word-level n-gram matching, i.e., matching words in one text with those in another. I recently had a chance to meet with Peter Leonard of Yale, who reacquainted me to another approach that he was involved with at the University of Chicago, called sequence alignment. This work was led by Mark Olsen as part of the ARTFL project at Chicago. This method is more flexible in searching for sequences of letters in an adaptive way. It’s useful to keep this in mind as another important approach for comparison and evaluation.
More information is available in this slide deck.