https://catholic.net/op/articles/2228/cat/1198/orientalium-dignitas.html
On the Churches of the East by Pope Leo XIII November 30, 1894
catholic netorientalium dignitas
https://www.vatican.va/content/john-paul-ii/la/apost_constitutions/documents/hf_jp-ii_apc_19901018_codex-can-eccl-orient-3.html
Codex Canonum Ecclesiarum orientalium
codexorientaliumdiexviiioctobris