Castelnuovo Curves and Unobstructed Deformations.
Characteristic classes and obstruction theory for infinite loop spaces.
Clinic obstructions and clinic cohomological groups.
Coherent prohomotopy theory
Cohomology and special extensions of groups
Constructing manifolds by homotopy equivalences I. An obstruction to constructing PL-manifolds from homology manifolds
We aim at constructing a PL-manifold which is cellularly equivalent to a given homology manifold . The main theorem says that there is a unique obstruction element in , where is the group of 3-dimensional PL-homology spheres modulo those which are the boundary of an acyclic PL-manifold. If the obstruction is zero and is compact, we obtain a PL-manifold which is simple homotopy equivalent to .