Perhaps this item is relevant: http://www.ams.org/notices/200811/tx081101370p.pdf
Thomas Hales, Formal Proof, Notices of the AMS 55 Issue 11 (2008) pp 1370-1380. (pdf)
And another item: Lamport's "structured proofs": http://research.microsoft.com/en-us/um/people/lamport/pubs/lamport-how-to-write.pdf
Leslie Lamport, How to write a proof (1995) (abstract)