We describe a method of manufacturing harmonic maps between semi-Riemannian spheres out of those in Riemannian geometry. After normalization, the resulting maps give examples of helical geodesic immersions in semi-Riemannian geometry.
"Construction of Harmonic Maps between Semi-Riemannian Spheres." Tsukuba J. Math. 31 (2) 397 - 409, December 2007. https://doi.org/10.21099/tkbjm/1496165155