Semi-Group Property of Propagators and the Gauge Invariance of the 1 st Kind
          . SEMINÁŘ TEORETICKÉ HO ODD. FZ Ú SLOVANKA 14. ÚNORA 2006. Semi-Group Property of Propagators and the Gauge Invariance of the 1 st Kind. B. Velický, Charles University and Acad. Sci. of CR, Praha A. Kalvová, Acad. Sci. of CR, Praha V. Špička , Acad. Sci. of CR, Praha. Introduction.
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