Memoirs of the American Mathematical Society, ISSN 1947-6221 ; Volume 233, Number 1100 (sixth of 6 numbers)
Print version: Friedman, Joel, 1962- Sheaves on graphs, their homological invariants, and a proof of the Hanna Neumann conjecture. Providence, Rhode Island : American Mathematical Society, c2014 xii, 106 pages Memoirs of the American Mathematical Society ; Volume 233, Number 1100 (sixth of 6 numbers) ISBN 9781470409883