@article {1704.08673, archivePrefix = {arXiv}, eprint = {1704.08673}, primaryClass = {math.AP}, author = {Jiayu Li and Lei Liu}, title = {Partial regularity of harmonic maps from a Riemannian manifold into a Lorentzian manifold}, year = {2017}, url = {http://arxiv.org/abs/1704.08673} }