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2. P. Di Vecchia, Lectures given at the Schladming Winter School, Austria. Published in Schladming School 1980:0341 (QCD161:I8:1980)
3. P. Di Vecchia, Lectures given at College de France, 2008 (unpublished notes)
4. Current algebra theorems for the U(1) “Goldstone boson”
5. U(1) without instantons