
1. A short review of previous results: an extended perturbative scheme for a localizable effective theory of strong interaction; reduction procedure and minimal parameters; minimal set of renormalization prescription fixing physical contents of an effective theory. 2. The method of Cauchy forms for functions of two variables 3. A test ground for our methods: Lovelace string amplitude (short review of general properties); Cauchy forms for the string amplitude. 4. The notion of duality revisited; bootstrap constraints for the stringlike amplitude. 5. Numerical tests of sum rules that follow from the bootstrap system for stringlike amplitude. 6. Renormalization prescriptions fixing treelevel 4leg vertices in a realistic effective scattering theory.
