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2010-10-24 18:11:17 - revision [ Version = 17 --> Version 18 ] by bci1 \subsubsection{References for NAAT} [1] M. Alp and C. D. Wensley, XMod, Crossed modules and Cat1--groups: a GAP4 package,(2004) (http://www.maths.bangor.ac.uk/chda/) [2] R. Brown, Elements of Modern Topology, McGraw Hill, Maidenhead, 1968. second edition as Topology: a geometric account of general topology, homotopy types, and the fundamentalgroupoid, Ellis Horwood, Chichester (1988) 460 pp. [3] R. Brown, \PMlinkexternal{`Higher dimensional group theory’}{http://www.bangor.ac.uk/∼mas010/hdaweb2.htm} [4] R. Brown.`Crossed complexes and homotopy groupoids as non commutative tools for higher dimensional local--to--global problems', Proceedings of the Fields Institute Workshop on Categorical Structures for Descent and Galois Theory, Hopf Algebras and Semiabelian Categories, September 23--28, 2002, Contemp. Math. (2004). (to appear), UWB Math Preprint 02.26.pdf (30 pp.) [5] R. Brown and P. J. Higgins, On the connection between the second relative homotopy groups of some related spaces, Proc.London Math. Soc., (3) 36 (1978) 193--212. [6] R. Brown and R. Sivera, `Nonabelian algebraic topology', (in preparation) Part I is downloadable from (http://www.bangor.ac.uk/~mas010/nonab-a-t.html) [7] R. Brown and C. B. Spencer, Double groupoids and crossed modules, Cahiers Top. G'/eom.Diff., 17 (1976) 343--362. [8] R. Brown and C. D.Wensley, `1Computation and homotopical applications of induced crossed modules', J. Symbolic Computation, 35 (2003) 59-72. [9] The GAP Group, 2004, GAP --Groups, Algorithms, and Programming, version 4.4 , Technical report, (http://www.grp-system.org) [10] A. Grothendieck, ‘Pursuing Stacks’, 600p, 1983, distributed from Bangor. Now being edited by G. Maltsiniotis for the SMF. [11] P. J. Higgins, 1971, Categories and Groupoids, Van Nostrand, New York. Reprint Series, Theory and Appl. Categories (to appear). [12] V. Sharko, 1993, Functions on manifolds: algebraic and topological aspects, number 131 in Translations of Mathematical Monographs, American Mathematical Society.

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