#### Volume 7, issue 1 (2003)

 1 M Chas, D Sullivan, String topology, Ann. of Math. $(2)$ (to appear) arXiv:math.GT/9911159 2 R L Cohen, J D S Jones, A homotopy theoretic realization of string topology, Math. Ann. 324 (2002) 773 MR1942249 3 M Gerstenhaber, The cohomology structure of an associative ring, Ann. of Math. $(2)$ 78 (1963) 267 MR0161898 4 E Getzler, Two-dimensional topological gravity and equivariant cohomology, Comm. Math. Phys. 163 (1994) 473 MR1284793 5 A B Goncharov, Y I Manin, Multiple $\zeta$–motives and moduli spaces $\overline{\mathcal{M}}_{0,n}$, Compos. Math. 140 (2004) 1 MR2004120 6 V Jones, Planar algebras I, arXiv:math.QA/9909027 7 R M Kaufmann, On several varieties of cacti and their relations, Algebr. Geom. Topol. 5 (2005) 237 MR2135554 8 R M Kaufmann, Operads, moduli of surfaces and quantum algebras, from: "Woods Hole mathematics", Ser. Knots Everything 34, World Sci. Publ., Hackensack, NJ (2004) 133 MR2123369 9 R M Kaufmann, On spineless cacti, Deligne's conjecture and Connes–Kreimer's Hopf algebra, Topology 46 (2007) 39 MR2288726 10 R M Kaufmann, R C Penner, Homological arc operads, in preparation 11 A Losev, Y Manin, New moduli spaces of pointed curves and pencils of flat connections, Michigan Math. J. 48 (2000) 443 MR1786500 12 M Markl, S Shnider, J Stasheff, Operads in algebra, topology and physics, Mathematical Surveys and Monographs 96, American Mathematical Society (2002) MR1898414 13 R C Penner, The simplicial compactification of Riemann's moduli space, from: "Topology and Teichmüller spaces (Katinkulta, 1995)", World Sci. Publ., River Edge, NJ (1996) 237 MR1659667 14 R C Penner, Decorated Teichmüller theory of bordered surfaces, Comm. Anal. Geom. 12 (2004) 793 MR2104076 15 R C Penner, J L Harer, Combinatorics of train tracks, Annals of Mathematics Studies 125, Princeton University Press (1992) MR1144770 16 P Salvatore, N Wahl, Framed discs operads and Batalin–Vilkovisky algebras, Q. J. Math. 54 (2003) 213 MR1989873 17 A A Voronov, Notes on universal algebra, from: "Graphs and patterns in mathematics and theoretical physics", Proc. Sympos. Pure Math. 73, Amer. Math. Soc. (2005) 81 MR2131012