1. Thomas’s structure bundle for conformal, projective and related structures;Bailey;Rocky Mountain J. Math.,1994
2. A. C˘ap, Two constructions with parabolic geometries, 2005 (preprint), arXiv:math.DG/0504389
3. Sur les variétés à connexion projective;Cartan;Bull. Soc. Math. France,1924
4. Connections of Berwald type;Crampin;Publ. Math. Debrecen,2000
5. M. Crampin, Isotropic and R-flat sprays, Houston J. Math (in press)