Degenerate vacuum formalism for spontaneous symmetry breakdown
1971 ◽
Vol 4
(5)
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pp. 632-637
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1992 ◽
Vol 07
(12)
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pp. 1009-1021
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2005 ◽
Vol 20
(01)
◽
pp. 175-198
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1983 ◽
Vol 17
(2)
◽
pp. 141-144