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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), p. 623-644

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

[Moo01] Moore, E. Graphs of groups: word computations and free crossed resolutions, University of Wales, Bangor, (2001)

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

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