1. R. Abraham, J.E. Marsden, and T. Ratiu. Manifolds, Tensor Analysis. and Applications. Springer, 1988.
2. P. Cermelli. Material symmetry and singularities in solids. Proceedings of the Royal Society of London, A 455:299–322, 1999.
3. S. Chandrasekhar. Liquid Crystals. Cambridge University Press, 1977.
4. C. Davini and G. Parry. A complete list of invariants for defective crystals. Proceedings of the Royal Society of London, 432:341–365, 1991.
5. A.C. Eringen and W.D. Claus. A micromorphic approach to dislocation theory and its relation to several existing theories. In J.A. Simmons, R. de Wit, and R. Bullough, editors, Fundamental Aspects of Dislocation Theory, pages 1023–1040. U.S. National Bureau of Standards, 1970.