H.A.G. Houghton, "Unfinished Business: The Ending of Mark in Two Catena Manuscripts." New Testament Studies 69.1 (2023) 35–42.

Abstract
Two Greek gospel manuscripts with an exegetical commentary in catena form present a text of Mark which ends in the middle of Mark 16.8. One is GA 304, a twelfth-century codex which is often adduced as a witness to the Short Ending. The other is the eleventh-century GA 239, which has not previously featured in discussions of the conclusion of Mark. In each case, it is shown that considerations of scribal practice, codicology and the broader traditions of text and catena mean that neither witness should be treated as evidence for the Short Ending as found in Codices Sinaiticus and Vaticanus.

Open Access: https://doi.org/10.1017/S0028688522000224