1. [1]A. Back—M. P. do Carmo—W.-Y. Hsiang,On the fundamental equations of equivariant geometry (unpublished manuscript).
2. J. L. Barbosa—M. do Carmo—J. Eschenburg,Stability of hypersurfaces of constant mean curvature in Riemannians manifolds, Math. Z.,197 (1988), pp. 123–138.
3. M. Bekkar,Exemples de surfaces minimales dans l'espace de Heisenberg H
3,Rend. Sem. Sci. Univ. Cagliari,61 (1991), no. 2, pp. 123–130.
4. M. Bekkar—T. Sari,Surfaces minimales reglées dans l'espace de Heisenberg H
3, Rend. Sem. Mat. Univ. Pol. Torino,50 (1992), no. 3, pp. 243–254.
5. G. Bredon,Introduction to Compact Transformation Groups, Academic Press, New York (1972).