1. CONNER, P.E., RAYMOND, F.: Deforming homotopy equivalences to homeomorphisms in aspherical manifolds. Bull.Am.Math.Soc.83, 1, 36?85 (1977)
2. EILENBERG, S., MacLANE, S.: Cohomology theory in abstract groups II. Ann. of Math.48, 2, 326?341 (1946)
3. FARRELL, F.T., HSIANG, W.C.: Topological characterisation of flat and almost flat Riemannian manifolds Mn (n?3,4), preprint, The university of Michigan, Ann Arbor
4. IGODT,P.: Constructing crystallographic groups starting with finite extensions of finitely generated abelian groups. Tijdschr.Belg.Wisk.GenootschapXXXIV,Ser B, 195?204 (1982)
5. KAMISHIMA, Y., LEE, K.B., RAYMOND, F.: The Seifert construction and its applications to infranilmanifolds. Quart. J.Math.Oxford(2),34, 433?452 (1983)