Jacobi Fields and Finsler Metrics on Compact Lie Groups with an Application to Differentiable Pinching Problems. Ernst A. Ruh, Karsten Grove, Hermann Karcher (1974) Mathematische Annalen
Jacobi maps between Riemannian manifolds. Belger, Martin, Milousheva, Velichka, Stanilov, Grozio (1995) Beiträge zur Algebra und Geometrie
Jacobi Tensors and Ricci Curvature. John J. O'Sullivan, Jost-Hinrich Eschenburg (1980) Mathematische Annalen