1. “Geometric Measure Theory.”;Federer,1969
2. Normal and integral currents;Federer;Ann. of Math.,1960
3. F. W. Gehring, Absolute continuity properties of quasiconformal mappings (to appear).
4. “Lectures on Algebraic Topology.”;Greenberg,1967
5. “Homotopy Theory.”;Hu,1959