I heard this example was given in Whitehead's paper A CERTAIN OPEN MANIFOLD WHOSE GROUP IS UNITY.( http://qjmath.oxfordjournals.org/content/os-6/1/268.full.pdf ) But I was confused by his term. Thus I'm looking for a standardan explanation in more standard terms about this example.
But since my aim is to know about an example of this kind, any alternative will do either.