1. Nonlinear Analysis on Manifolds. Monge-Ampere Equations;Aubin,1980
2. Gauge invariant variables in the Yang-Mills theory;Bialynicki-Birula;Bull. de l'Acad. Polonaise des Sciences,1963
3. Some non-abelian methods in homotopy theory and homological theory;Brown,1983
4. Differential Forms in Algebraic Topology;Bott,1982
5. Sur la cohomologie non abelian, I (dimension deux);Decker;Canad. J. of Math.,1960