Symmetry principles in elementary particle physics / W. M. Gibson, B. R. Pollard. Gibson, W. M. Pollard, B. R., joint author. Symmetry (Physics) QC793.3.S9 G5 539.73 GIS Includes index. Bibliography: p. 367-372. Cambridge [Eng.] ; New York : Cambridge University Press, c1976. c1976. 1976 Text xi, 380 p. : http://www.loc.gov/catdir/enhancements/fy1011/74031796-d.html http://www.loc.gov/catdir/enhancements/fy1011/74031796-t.html eng Cambridge monographs on physics