1. J. Dieudonn�, Treatise on Analysis, Volume 3, Academic Press (New York, 1972).
2. P. Dombrowski, # 3469. MR. 37.
3. P. Dombrowski, On the geometry of the tangent bundle, J. Reine Angew. Math., 210 (1962), 73?88.
4. T.V. Duc, Sur la geometrie differentielle des fibres vectoriels, Kodai Math. Sem. Rep., 26 (1975), 349?408.
5. W. Greub, S. Halperin and R. Vanstone, Connections, Curvature and Cohomology, Volume I, II, Academic Press (New York, 1972, 1973).