Metric tensors for homogeneous, isotropic, 5-dimensional pseudo Riemannian models. Anchordoqui, Luis A., Birman, Graciela S. (1998) Revista Colombiana de Matemáticas
Multi-instantons in higher dimensions and superstring solitons. Loginov, Eugene K. (2005) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]