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Lectures given at the 4th Bulgarian Summer School on Mathematical Problems of Quantum Field Theory
| Autores principales: | , |
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| Lenguaje: | eng |
| Publicado: |
Springer
1982
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| Acceso en línea: | https://dx.doi.org/10.1007/BFb0066021 http://cds.cern.ch/record/1696055 |