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

 1 M Artin, B Mazur, Etale homotopy, Lecture Notes in Mathematics 100, Springer (1969) MR0245577 2 M Bestvina, M Kapovich, B Kleiner, Van Kampen's embedding obstruction for discrete groups, Invent. Math. 150 (2002) 219 MR1933584 3 K S Brown, Cohomology of groups, Graduate Texts in Mathematics 87, Springer (1994) MR1324339 4 D A Edwards, R Geoghegan, The stability problem in shape, and a Whitehead theorem in pro-homotopy, Trans. Amer. Math. Soc. 214 (1975) 261 MR0413095 5 M Kapovich, B Kleiner, Coarse Alexander duality and duality groups, J. Differential Geom. 69 (2005) 279 MR2168506 6 S Mardešić, On the Whitehead theorem in shape theory I, Fund. Math. 91 (1976) 51 MR0407798 7 A Shapiro, Obstructions to the imbedding of a complex in a euclidean space I: The first obstruction, Ann. of Math. $(2)$ 66 (1957) 256 MR0089410 8 E R van Kampen, Komplexe in euklidischen Raumen, Abh. Math. Sem. Univ. Hamburg 9 (1933) 72, 152