Cole, Zachary J. "P45 and the Problem of the Seventy(-two): A Case for the Longer Reading in Luke 10.1 and 17," New Testament Studies, 63 (2017): 203–221.
At Luke 10.17, most modern critical editions incorrectly cite the wording of P45 as ἑβδομήκοντα δύο (72) instead of ἑβδομήκοντα (70). As this is one of the two oldest witnesses to the verse, this revision of external evidence calls for a fresh examination of the textual problem as a whole. Previous discussions have focused almost exclusively on the perceived symbolic values of ἑβδομήκοντα (+ δύο) to identify the ‘more Lukan’ wording, but this essay argues on the basis of new transcriptional evidence that the earlier reading is more likely ἑβδομήκοντα δύο.
Cambridge University Press