GA L2378 aka "Codex Angus" has improtant new article to add to the bibliography as well as a full set of publically accessible images:
A Note on the Codex Angus and Its Use
By Doru Costache
12 Pages
2024, The Journal of Ecclesiastical History
Hefin:
Also comparing the pencilled foliation with another Kosinista ms (Ek. 220) suggests a connection with Vladimir Sis prior to L2378 passing into the hands of Adolf Diessmann. (cf. 220 f. 196 with Codex Angas f. 96)
Images here:
https://digital.library.sydney.edu.au/nodes/view/15143#idx406604