1. Chen, Y.M., Struwe, M.: Existence and partial regularity results for the heat flow for harmonic maps. Math. Z. 201(1), 83–103 (1989)
2. De Gennes, P.G., Prost, J.: The physics of liquid crystals. Oxford University Press, Oxford (1993)
3. DiPerna, R.J., Majda, A.: Reduced Hausdorff dimension and concentration-cancellation for two-dimensional incompressible flow. J. Amer. Math. Soc. 1(1), 59–95 (1988)
4. Ericksen, J.L.: Hydrostatic theory of liquid crystal. Arch. Ration Mech. Anal. 9, 371–378 (1962)
5. Evans, L.C., Gariepy, R.: Measure Theory and Fine Properties of Functions. CRC Press, Boca Raton (1992)