1. D. E. Blair, Geometry of manifolds with structural groupU(n)×O(s).J. Diff. Geom.,4 (1970), 155–167.
2. D. E. Blair, On a generalization of the Hopf fibration,Ann. Stiin. Univ. “Al. I. Cuza” Iasi (Serie nova),XVII (1971), 171–177.
3. D. E. Blair, G. D. Ludden and K. Yano, Differential geometric structures on principal toroidal bundles,Trans. Am. Math. Soc.,181 (1973), 175–184.
4. L. M. Fernández, Submanifolds in toroidal bundles, inProceedings of the VI-th International Colloquium on Differential Geometry, Santiago de Compostela (Spain), 1988. cursos y Congresos, Univ. Santiago de Compostela 61 (1989), 85–98.
5. I. Hasegawa, Y. Okuyama and T. Abe, Onp-th Sasakian manifolds,J. Hokkaido Univ. Ed. (Section II A),37 (1986), 1–16.