Physical structure of the energy-momentum tensor in General Relativity G. S. HallD. A. Negm OriginalPaper Pages: 405 - 423
New approach to Einstein-Petrov type I spaces. II. A classification scheme S. B. Edgar OriginalPaper Pages: 425 - 433
What is an elementary physical object? A system-theoretic approach L. Szabó OriginalPaper Pages: 435 - 439
Hyperspin manifolds David FinkelsteinShlomit Ritz FinkelsteinChristian Holm OriginalPaper Pages: 441 - 463