There is no single academic "paper" on this specific topic, but there is extensive technical documentation and community research regarding the for Tekken Tag Tournament 2 on the RPCS3 emulator.
In the original console release, characters like Angel , Michelle Chang , and Ancient Ogre were technically already on the disc but "time-locked". Players had to download a small compatibility patch (Update 1.01 and higher) to unlock them. On RPCS3, simply having the game file is not enough; the emulator needs to see a specific or update package that tells the game the DLC has been "purchased". Step-by-Step: Unlocking All DLC Characters tekken tag 2 dlc rpcs3 exclusive
: Some players confuse emulator features with the Wii U Edition of the game, which featured exclusive Nintendo-themed costumes (Link, Mario, Zelda) and the "Mushroom Battle" mode. These are not natively available in the PS3/RPCS3 version. There is no single academic "paper" on this