Dicks, Warren, (1947-)

Sheaves on graphs, their homological invariants, and a proof of the Hanna Neumann conjecture / by: Dicks, Warren, (1947-); Friedman, Joel, (1962-) (Language materials, printed)

Groups acting on graphs / by: Dicks, Warren, (1947-); Dunwoody, M. J. (Language materials, printed)