I've been thinking about various time-travel related paradoxes, and have wondered what the name of the paradox is where something doesn't have a cause. Take the following example:
Let's say there is a piece of paper with some informaton on it. Bob is a time traveller, and travels from the year 2010 to 2000 to give this piece of paper to Alice (who is not a time traveller.) This by chance happens to the the first time Alice has met Bob, but the second time Bob has met Alice (relative to their own timeline's.) Alice then meets Bob later on and gives him the piece of paper (Second time Alice meets Bob, First time Bob meets Alice.) This is where Bob get's the piece of paper that he transports back in time to Alice.
This covers 2 things that need a cause which don't seem to have one: the information and the physical paper. This could come up in say, travelling to the future to seek out advance medicine, but it is "invented" by seeing into the future, thus once again removing any proper cause.
I'm unsure as to what the name of this paradox would be. At first I thought it might be covered by the grandfather paradox, but later decided it probably doesn't. The reason I'm thinking it might not is that in the grandfather paradox there is a clearly identified cause and effect (cause: grandfather having children, effect: grandchild exists) and the paradox is that the effect is removing it's own cause rather than there not been any cause. In this paradox though, there isn't an identified cause at all.
I have tried searching for keywords such as "recursive paradox" and "no-cause paradox" but can't seem to find anything.
Any thoughts as to what category it fits into?