Titlebook: Concepts in Hadron Physics; Proceedings of the X Paul Urban (Vorstand des Institutes für Theoretisc Conference proceedings 1971 Springer-Ve

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Perturbation Theory for a Class of Nonpolynomial Lagrangian Field Theories,e stated for the case of a scalar field with exponential self-interaction. A less academic model is the derivative coupling of a spinor field with a neutral pseudoscalar field transformed to exponential form which can be treated by the same methods.

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,Summary — First Week,s me more deeply than poor lecturing but all of the talks during this years first week were of very high standard or at least not below average. For this fine performance I would like to thank all lecturers collectively and very sincerely.

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