[3] Brown, R., Possible connections between whiskered categories and groupoids leibniz algebras automorphism
structure and local-to-global questions, Journal of Homotopy and Related Structures, 5, 1, 308-318, (2010).
[4] Brown, R., From groups to groupoids, Bull. London Math Soc., 19, 1, 113-134, (1987).
[5] Brown, R., Gilbert, N.D., Algebraic models of 3-types and automorphism structures for crossed modules, Proc.
London Math Soc., 3, 51-73,(1989).
[6] Brown, R., Higgins, P.J., On the algebra of cubes, Journal of Pure and Applied Algebra, 21, 233-260,(1981).
[7] Brown, R., Spencer, C.B., G-groupoids, crossed modules and fundamental groupoid of a topological group, Proc.
Konink. Neder. Akad. Van Wetenschappen Amsterdam, 79, 4,(1976).
[8] Conduche, D., Modules croises generalises de longuer 2, Journal of Pure and Applied Algebra, 34, 155-178,
(1984).
[9] Loday, J.L., Spaces with nitely many non-trival homotopy groups, Journal of Pure and Applied Algebra, 24,
179-202, (1982).
[10] Ulualan, E., Pak, S., Braiding for internal categories in the category of whiskered groupoids and simplicial
groups, Turk J Math ,37 , 145-164,(2013).
[3] Brown, R., Possible connections between whiskered categories and groupoids leibniz algebras automorphism
structure and local-to-global questions, Journal of Homotopy and Related Structures, 5, 1, 308-318, (2010).
[4] Brown, R., From groups to groupoids, Bull. London Math Soc., 19, 1, 113-134, (1987).
[5] Brown, R., Gilbert, N.D., Algebraic models of 3-types and automorphism structures for crossed modules, Proc.
London Math Soc., 3, 51-73,(1989).
[6] Brown, R., Higgins, P.J., On the algebra of cubes, Journal of Pure and Applied Algebra, 21, 233-260,(1981).
[7] Brown, R., Spencer, C.B., G-groupoids, crossed modules and fundamental groupoid of a topological group, Proc.
Konink. Neder. Akad. Van Wetenschappen Amsterdam, 79, 4,(1976).
[8] Conduche, D., Modules croises generalises de longuer 2, Journal of Pure and Applied Algebra, 34, 155-178,
(1984).
[9] Loday, J.L., Spaces with nitely many non-trival homotopy groups, Journal of Pure and Applied Algebra, 24,
179-202, (1982).
[10] Ulualan, E., Pak, S., Braiding for internal categories in the category of whiskered groupoids and simplicial
groups, Turk J Math ,37 , 145-164,(2013).