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Feighn and Handel proved that they're all coherent in 'Mapping tori of free group automorphisms are coherent', Ann. of Math. (2) 149 (1999), no. 3, 1061--1077.
Feighn and Handel proved that they're all coherent in 'Mapping tori of free group automorphisms are coherent', Ann. of Math. (2) 149 (1999), no. 3, 1061--1077.
