Academic work on the Greek corpus attributed to St. Ephrem (i.e., Ephraem Graecus) is still, unfortunately, rare. I’m happy to pass along this article.
Emmanouela Grypeou, “Ephraem Graecus, ‘Sermo In Adventum Domini’. A Contribution to the Study of the Transmission of Apocalyptic Motifs in Greek, Latin and Syriac Traditions in Late Antiquity,” in Graeco-Latina et Orientalia: Studia in honorem Angeli Urbani heptagenarii, ed. Samir Khalil Samir and Juan Pedro Monferrer-Sala (Cordoba: Oriens Academic, 2013), 165-79.