Giles identifies this as the "upgrade" from 50/50 because it provides superior control of the opponent's knee and prevents hand fighting. Key Technical Concepts
While there is no academic "paper" on this topic, is a highly technical, 8-volume instructional series by PhD holder and ADCC medalist Lachlan Giles . It documents the submission system he used to defeat three world-class heavyweights at the 2019 ADCC World Championships. System Core & Strategy Leg Lock Anthology 50-50 by Lachlan Giles
The system is praised for its "PhD-level" organization and depth of detail. Leg lock anthology technique list available Giles identifies this as the "upgrade" from 50/50