https://www.abebooks.com/9783540437963/Invariants-Homology-3-Spheres-Saveliev-Nikolai-3540437967/plp
Homology 3-sphere is a closed 3-dimensional manifold whose homology equals that of the 3-sphere. These objects may look rather special but they have played an...
invariantshomologyspheressavelievnikolai