#### Volume 6, issue 4 (2006)

 1 D V Bolotov, Macroscopic dimension of 3–manifolds, Math. Phys. Anal. Geom. 6 (2003) 291 MR1997917 2 M Gromov, Positive curvature, macroscopic dimension, spectral gaps and higher signatures, Preprint (1996) 3 J W Milnor, Topology from the differentiable viewpoint, Based on notes by David W. Weaver, The University Press of Virginia, Charlottesville, Va. (1965) MR0226651 4 J W Milnor, J D Stasheff, Characteristic classes, Annals of Mathematics Studies 76, Princeton University Press (1974) MR0440554 5 E H Spanier, Algebraic topology, McGraw-Hill Book Co. (1966) MR0210112 6 N E Steenrod, Cohomology operations, Lectures by N. E. Steenrod written and revised by D. B. A. Epstein. Annals of Mathematics Studies, No. 50, Princeton University Press (1962) MR0145525 7 H Whitney, Differentiable manifolds, Ann. of Math. $(2)$ 37 (1936) 645 MR1503303