Triangolo di lettere - Nietzsche, Friedrich, 1844-1900. (OLS)http://ftis/name/51781; Andreas-Salomé, Lou. (OLS)http://ftis/name/82423; Carpitella, Mario. (OLS)http://ftis/name/53219; Pfeiffer, Ernst. (OLS)http://ftis/name/82424; Rée, Paul. (OLS)http://ftis/name/87017 (Adelphi,, 2011)