#### Volume 11, issue 4 (2011)

 1 J F Adams, On the non-existence of elements of Hopf invariant one, Ann. of Math. $(2)$ 72 (1960) 20 MR0141119 2 J F Adams, On the groups $J(X)$ IV, Topology 5 (1966) 21 MR0198470 3 W D Barcus, M G Barratt, On the homotopy classification of the extensions of a fixed map, Trans. Amer. Math. Soc. 88 (1958) 57 MR0097060 4 J M Boardman, B Steer, On Hopf invariants, Comment. Math. Helv. 42 (1967) 180 MR0221503 5 G E Bredon, Regular $\mathbb{O}(n)$–manifolds, suspension of knots, and knot periodicity, Bull. Amer. Math. Soc. 79 (1973) 87 MR0310901 6 W Browder, Embedding smooth manifolds, from: "Proc Internat. Congr. Math. (Moscow, 1966)", Izdat. “Mir”, Moscow (1968) 712 MR0238335 7 M Čadek, M Crabb, $G$–structures on spheres, Proc. London Math. Soc. $(3)$ 93 (2006) 791 MR2266967 8 S E Cappell, J L Shaneson, Topological knots and knot cobordism, Topology 12 (1973) 33 MR0321099 9 F R Cohen, A course in some aspects of classical homotopy theory, from: "Algebraic topology (Seattle, Wash., 1985)", Lecture Notes in Math. 1286, Springer (1987) 1 MR922923 10 M Š Farber, Isotopy types of knots of codimension two, Trans. Amer. Math. Soc. 261 (1980) 185 MR576871 11 J P E Hodgson, Questions appearing in the Problem Session, from: "Proceedings of the Northwestern Homotopy Theory Conference (1982)", Contemp. Math. 19 (1983) 448 12 L H Kauffman, Branched coverings, open books and knot periodicity, Topology 13 (1974) 143 MR0375337 13 J R Klein, On the homotopy embeddability of complexes in Euclidean space I: The weak thickening theorem, Math. Z. 213 (1993) 145 MR1217676 14 J R Klein, Poincaré duality embeddings and fiberwise homotopy theory, Topology 38 (1999) 597 MR1670412 15 A A Kosinski, Differential manifolds, Pure and Applied Mathematics 138, Academic Press (1993) MR1190010 16 J Levine, Unknotting spheres in codimension two, Topology 4 (1965) 9 MR0179803 17 J Levine, Knot cobordism groups in codimension two, Comment. Math. Helv. 44 (1969) 229 MR0246314 18 M Mahowald, The image of $J$ in the $EHP$ sequence, Ann. of Math. $(2)$ 116 (1982) 65 MR662118 19 W Richter, High-dimensional knots with $\pi_1\cong\mathbb{Z}$ are determined by their complements in one more dimension than Farber's range, Proc. Amer. Math. Soc. 120 (1994) 285 MR1195730 20 W Richter, A homotopy-theoretic proof of Williams's metastable Poincaré embedding theorem, Duke Math. J. 88 (1997) 435 MR1455528 21 P Selick, 2–primary exponents for the homotopy groups of spheres, Topology 23 (1984) 97 MR721456 22 H Toda, Composition methods in homotopy groups of spheres, Annals of Mathematics Studies 49, Princeton University Press (1962) MR0143217 23 C T C Wall, Poincaré complexes I, Ann. of Math. $(2)$ 86 (1967) 213 MR0217791 24 C T C Wall, Surgery on compact manifolds, London Mathematical Society Monographs 1, Academic Press (1970) MR0431216 25 G W Whitehead, Elements of homotopy theory, Graduate Texts in Mathematics 61, Springer (1978) MR516508