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This paper, based on things already written somewhere with the addition of some details from lectures, contains nothing or little especially new. Even the main `result', summarized in Eq.(35) and that I hope will contribute to set down the questions raised by [1], is just a simple extension of Eq. (8.33) of Ref. [2]. Therefore the debated question could be dismissed with a paper even shorter than Nevertheless, I have taken the opportunity to reorganize old material for the benefit of my students, and I post these pages hoping they could be of some utility to those who wish to understand what there is behind formulas.

Giulio D'Agostini 2005-11-21