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How about the original: http://www.bitcoin.org/bitcoin.pdf?

Would you care to explain how a Sybil attack applies? There are no identities nor any kind of reputation system in bitcoin.

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Of course there are. The identities and "distributed part" has to do with the servers that keep record of things in Bitcoin. In fact, a few months ago an economist wrote an article (which was here on HN) that described how the protocol among the "bank" servers in Bitcoin can be broken if there is a coalition of other "bank" servers that choose deviate. This was, in Computer Science terms, one expression of a Sybil Attack.

You should check Wikipedia for the background on Sybil Attacks.

Oh, and, the original Bitcoin paper -- I don't believe is published in a venue that is well known (or even known).

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