Kunzinger, Michael, Hermann Schichl, Roland Steinbauer, y James A. Vickers. 2006. «Global Gronwall Estimates for Integral Curves on Riemannian Manifolds». Revista Matemática Complutense 19, nº 1:: 133-37. https://doi.org/10.5209/rev_REMA.2006.v19.n1.16639