1. Chang, K.C.: Heat flow and boundary value problem for harmonic maps. (preprint 1988)
2. Chen, Y., Struwe, M.: Existence and partial regularity for heat flow for harmonic maps. Math. Z.201, 83–103 (1989)
3. Coron, J.M., Ghidaglia, J.M.: Explosion en temps fini pour le flot des applications harmoniques. C.R. Acad. Sci. Paris308, Serie I 339–344 (1989)
4. ding, W.Y.: Blow-up of solutions of heat flows for harmonic maps. (preprint 1988)
5. Eells, J., Lemaire, L.: A report on harmonic maps. Bull. Lond. Math. Soc.16, 1–68 (1978)