books.google.com - This collection of papers provides a broad view of the development of Lorentz and Poincar(r) invariance and spacetime symmetry throughout the past 100 years. The issues explored in these papers include: (1) formulations of relativity theories in which the speed of light is not a universal constant but...https://books.google.com/books/about/Lorentz_and_Poincar_Invariance.html?id=jryk42J8oQIC&utm_source=gb-gplus-shareLorentz and Poincar Invariance
