#### Volume 6, issue 3 (2006)

 1 L Borsari, D Gonçalves, The first (co)-homology group with local coefficient system, preprint (2003) 2 J A Daccach, V S Franco, A formula for extension of Poincaré duality groups, from: "XI Brazilian Topology Meeting (Rio Claro, 1998)", World Sci. Publ., River Edge, NJ (2000) 99 MR1835693 3 R Dobreńko, The obstruction to the deformation of a map out of a subspace, Dissertationes Math. $($Rozprawy Mat.$)$ 295 (1990) 29 MR1082410 4 R Dobreńko, On the deformation of a map out of a subspace, preprint (1991) 5 A Dold, Lectures on algebraic topology, Grundlehren series 200, Springer (1980) MR606196 6 D Gonçalves, P Wong, Obstruction theory and coincidences of maps between nilmanifolds, Arch. Math. $($Basel$)$ 84 (2005) 568 MR2148577 7 D Gonçalves, P Wong, J Jezierski, Obstruction theory and coincidences in positive codimension, Acta Math. Sin. (Engl. Ser.) 22 (2006) 1591 8 D H Gottlieb, Partial transfers, from: "Geometric applications of homotopy theory (Proc. Conf., Evanston, Ill., 1977), I", Lecture Notes in Math. 657, Springer (1978) 255 MR513552 9 D H Gottlieb, The trace of an action and the degree of a map, Trans. Amer. Math. Soc. 293 (1986) 381 MR814928 10 W S Massey, Homology and cohomology theory, Marcel Dekker (1978) MR0488016 11 H Samelson, On the Thom class of a submanifold, Michigan Math. J. 12 (1965) 257 MR0180974 12 E Spanier, Duality in topological manifolds, from: "Colloque de Topologie (Brussels, 1964)", Librairie Universitaire, Louvain (1966) 91 MR0220297 13 G W Whitehead, Elements of homotopy theory, Graduate Texts in Mathematics 61, Springer (1978) MR516508 14 A Wyler, Sur certaines singularités d'applications de variétés topologiques, Comment. Math. Helv. 42 (1967) 28 MR0214075