Other than Thurston's original paper (which I find quite hard to read), are there any expositions of the basic properties of the Thurston norm? In particular, I'm interested in a proof of his characterization of which homology classes can be represented by fibers. Some parts of this can be found in Kapovich's book, but he does not discuss the result I alluded to in my previous sentence.
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5$\begingroup$ You could have a look at Chapter 10 of Candel Conlon, Foliations II. books.google.com/… $\endgroup$– Ian AgolCommented Jan 12, 2012 at 5:26
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3$\begingroup$ Give a look also to Calegari - Foliations and the geometry of 3-manifolds. $\endgroup$– Francesco LinCommented Jan 12, 2012 at 11:10
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5$\begingroup$ Actually, I think Thurston's paper IS the canonical reference, because most people find it quite well-written. $\endgroup$– Igor RivinCommented Jan 12, 2012 at 11:19
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