#### Volume 4, issue 1 (2004)

 1 J C Baez, J Dolan, Categorification, from: "Higher category theory (Evanston, IL, 1997)", Contemp. Math. 230, Amer. Math. Soc. (1998) 1 MR1664990 2 C Balteanu, Z Fiedorowicz, R Schwänzl, R Vogt, Iterated monoidal categories, Adv. Math. 176 (2003) 277 MR1982884 3 J M Boardman, R M Vogt, Homotopy invariant algebraic structures on topological spaces, Lecture Notes in Mathematics 347, Springer (1973) MR0420609 4 J W Duskin, Simplicial matrices and the nerves of weak $n$–categories. I. Nerves of bicategories, Theory Appl. Categ. 9 (2001/02) 198 MR1897816 5 S Eilenberg, G M Kelly, Closed categories, from: "Proc. Conf. Categorical Algebra (La Jolla, Calif., 1965)", Springer (1966) 421 MR0225841 6 Z Fiedorowicz, The symmetric bar construction, preprint 7 S Forcey, Higher dimensional enrichment arXiv:math.CT/0306086 8 S Forcey, Enrichment as categorical delooping I: Enrichment over iterated monoidal categories arXiv:math.CT/0304026 9 A Joyal, R Street, Braided tensor categories, Adv. Math. 102 (1993) 20 MR1250465 10 G M Kelly, Basic concepts of enriched category theory, London Mathematical Society Lecture Note Series 64, Cambridge University Press (1982) 245 MR651714 11 V Lyubashenko, Category of $A_\infty$–categories, Homology Homotopy Appl. 5 (2003) 1 MR1989611 12 S Mac Lane, Categories for the working mathematician, Graduate Texts in Mathematics 5, Springer (1998) MR1712872 13 S Mac Lane, Categorical algebra, Bull. Amer. Math. Soc. 71 (1965) 40 MR0171826 14 J P May, The geometry of iterated loop spaces, Lectures Notes in Mathematics 271, Springer (1972) MR0420610 15 J D Stasheff, Homotopy associativity of $H$–spaces I, II, Trans. Amer. Math. Soc. 108 $(1963)$, 275-292; ibid. 108 (1963) 293 MR0158400 16 R Street, The algebra of oriented simplexes, J. Pure Appl. Algebra 49 (1987) 283 MR920944