The addition of "" at the end of such strings is typically a metadata tag used by specific scene release groups or internal indexing systems to categorize the content or indicate its source/format within a database.
If you are looking for information regarding a specific academic "paper" or document related to this, there is no public record of a legitimate publication using this title; it remains strictly a technical identifier for adult media. EvilAngel.22.02.19.Elena.Lux.XXX.1080p.HEVC.x26...
The phrase you provided appears to be a featuring Elena Lux, released by the studio Evil Angel on February 19, 2022. The addition of "" at the end of