MathSciNet bibliographic data

MR895622 (89c:20057) 20F32 (57M99) Alperin, Roger; Bass, Hyman Length functions of group actions on $\Lambda$-trees. Combinatorial group theory and topology (Alta, Utah, 1984), 265--378, Ann. of Math. Stud., 111, Princeton Univ. Press, Princeton, NJ, 1987.

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