The string theory is a fast moving subject, both physics wise and in the respect of mathematics. In order to keep up with the discipline it is important to move with new ideas which are being stressed. Here I wish to give extracts from new papers of ideas which I have recently found interesting. There are six papers which are involved: I ."Strings formulated directly in 4 dimensions " A. N...

Abstract I start describing my interaction with Bruno during thesis and then in his group Frascati connection the calculation of total cross-section double bremsstrahlung that, at that time, was considered a good candidate as monitor reaction for Adone. Then discuss transition to S-matrix theory work brought from Dual Resonance Model String Theory. conclude main results Theory way could be foll...

A bstract In [4] Balthazar, Rodriguez and Yin (BRY) computed the one instanton contribution to two point scattering amplitude in dimensional string theory first subleading order coupling. Their analysis left undetermined constants due divergences integration over world-sheet variables, but they were fixed by numerically comparing result with that of dual matrix model. If we consider n-point amp...