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The concept of indistinguishable particles in classical and quantum physics Alexander Bach OriginalPaper Pages: 639 - 649
On the choice of evolutional parameter within a framework of four-dimensional symmetry T. Chang OriginalPaper Pages: 651 - 658
The Schwarzschild solution: Some conceptual difficulties J. V. NarlikarT. Padmanabhan OriginalPaper Pages: 659 - 668
Quantum mechanics and the physical reality concept Horst-Heino von BorzeszkowskiRenate Wahsner OriginalPaper Pages: 669 - 681