See "12 Critical Apparatus", Guidelines for Electronic Text Encoding and Interchange, Text Encoding Initiative, version 4.3.0 (updated 31 August 2021), archived 2 September 2021 at archive.today.
Ashburner, Walter, ed. (1909). Rhodian Sea-Law. Oxford: Clarendon Press. p. iii.
tei-c.org
See "12 Critical Apparatus", Guidelines for Electronic Text Encoding and Interchange, Text Encoding Initiative, version 4.3.0 (updated 31 August 2021), archived 2 September 2021 at archive.today.