Kasman, Reva Sharon. Trees, norms on H(1), and the Bieri-Neumann-Strebel invariant. Trees, norms on H(1), and the Bieri-Neumann-Strebel invariant. Mathematics. 2014-03-17
    https://indigo.uic.edu/articles/thesis/Trees_norms_on_H_1_and_the_Bieri-Neumann-Strebel_invariant_/10793585