Could you please recommend a sufficiently elementary introduction to K3 gravitational instanton in general relativity and the problem of finding its explicit form?

Under 'sufficiently elementary' I mean the texts geared at physicists with basic knowledge of general realtivity but not much more than that (i.e. with almost no knowledge of modern differential geometry and algebraic geometry). To give a hint, I find the description of the problem in the book *Solitons, Instantons and Twistors* by Maciej Dunajski way too terse.

Many thanks in advance!

This post imported from StackExchange Physics at 2014-04-25 13:33 (UCT), posted by SE-user just-learning