Klein's paradox in a four-space formulation of Dirac's equation A. B. Evans OriginalPaper Pages: 633 - 647
On the quantum Hamilton-Jacobi formalism Antonio Soares de CastroAlvaro de Souza Dutra OriginalPaper Pages: 649 - 663
Formalism to deal with Reichenbach's special theory of relativity Abraham A. Ungar OriginalPaper Pages: 691 - 726