I don't agree with Syrial. It's not the objects or items referred to that distinguishes 'them' from 'those'.
'Those' would refer to items which have already been identified/indicated/pointed out, as opposed to [instead of] some other items. There is an alternative implied : 'these' [over here], or 'those' [over there].
' These are the papers in English, and the ones over there are in Japanese ; take one of those, and read it '.
' The papers in Japanese are over there ; take one of them and read it '