1. D. Burghelea, Linear Relations, Monodromy and Jordan Cells of a Circle Valued Map, arXiv:1501. 02486.
2. D. Burghelea, Refinements of Betti Numbers Provided by a Real Valued Map, arXiv:1501.01012.
3. D. Burghelea, Refinements of Betti Numbers Provided by an Angle Valued Map (in preparation).
4. D. Burghelea, Refinements for Novikov–Betti Numbers = L2-Betti Numbers of (X, ξ ∈ H1(X;ℤ)) Induced by an Angle Valued Map f : X → 𝕊1 (in preparation).
5. D. Burghelea and T. K. Dey, “Persistence for circle-valued maps,” Discrete Comput. Geom., 50, No. 1, 69–98 (2013); arXiv:1104.5646.