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References

[Bro88] Brown, R., Topology: a geometric account of general topology, homotopy types, and the fundamental groupoid, Ellis Horwood, Chichester (1988).

[Bro06] Brown, R., Topology and groupoids, www.groupoids.org, Deganwy (2006).

[BMPW02] Brown, R., Moore, E. J., Porter, T. and Wensley, C. D., Crossed complexes, and free crossed resolutions for amalgamated sums and HNN-extensions of groups, Georgian Math. J., 9 (2002), 623-644.

[Hig76] Higgins, P., The fundamental groupoid of a graph of groups, J. London Math. Soc., 13 (1976), 145-149.

[Moo01] Moore, E., Graphs of groups: word computations and free crossed resolutions, Ph.{D}.~thesis, University of Wales, Bangor (2001).

[Ser80] Serre, J., Trees, Springer-Verlag, Berlin (1980).

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