Are you referring to a specific paper you know exists or just speculating? Specifically what do you mean by "internals"? Do you mean the JET database engine? Do you mean storage? Do you mean retrieval? Do you mean query optimisation?
Concurrency control is not something one would typically be all that bothered about at the engine level (at least not in Access). It would also comprise a tiny proportion of any comprehensive discussion of Access\ JET internals.
Could you give us a bit more background about what you want to know and why?