Cabrerizo, Jose L.; Fernandez, Manuel; Ortega, Miguel Massless particles in three-dimensional Lorentzian warped products. (English) Zbl 1121.53046 J. Math. Phys. 48, No. 1, 012901, 12 p. (2007). MSC: 53C50 58E50 PDFBibTeX XMLCite \textit{J. L. Cabrerizo} et al., J. Math. Phys. 48, No. 1, 012901, 12 p. (2007; Zbl 1121.53046) Full Text: DOI Link
Barros, Manuel; Caballero, Magdalena; Ortega, Miguel Massless particles in warped three spaces. (English) Zbl 1098.83008 Int. J. Mod. Phys. A 21, No. 3, 461-473 (2006). Reviewer: Johannes Viktor Feitzinger (Bochum) MSC: 83C10 83C20 70H40 PDFBibTeX XMLCite \textit{M. Barros} et al., Int. J. Mod. Phys. A 21, No. 3, 461--473 (2006; Zbl 1098.83008) Full Text: DOI