English documents ........................................................................................................................................................................................
“Quaderni di Ricerca in Didattica”, n. 19, 2009 - G.R.I.M. (Department of Mathematics, University of Palermo, Italy) - Pubblication of C.Ha.S. model (Italian and English pdf): A NEW MODEL OF INTERPRETATION OF SOME ACOUSTIC PHENOMENA - CIRCULAR HARMONIC SYSTEM – C.HA.S.
The Harmonic Temperament - C.Ha.S. - Aural Preparatory Tuning - Sequence Flowchart (english e in français)
March 2007 - Extract from the presentation given by Alfredo Capurso, piano technician and tuner, on 23rd March 2007 at the Convention held in Messina: “Mandelbrot and Fractal Geometry Forty Years Later”
