1. “Topologie.”;Alexandroff,1965
2. The Lefschetz theorem on hyperplane sections;Andreotti;Ann. of Math.,1959
3. Sur la courbure de Riemann des groupes de difféomorphismes;Arnold;Compt. Rend.,1965
4. Homotopy and homology related to the Schoenflies problem;Baiada;Ann. of Math.,1953
5. “A Survey of Modern Algebra.”;Birkhoff,1953