1. Aeppli, A., Die Einzigkeit des σn,k-Prozesses. To be published.
2. Borel, A. and F. Hirzebruoh, On the characteristic classes of homogeneous spaces. To be published.
3. On the characteristic classes of complex sphere bundles and algebraic varieties;Chern;Am. J. of Math.,1953
4. On the topology of certain birational transformations;Denniston;Ann. of Math,1956
5. Interpretazione topologica dei covarianti di Beniamino Segre;Guggenheimer;Atti Accad. Naz. Lincei. Rend. Cl. Sci. Fis. Mat. Nat.,1954