GONZÁLEZ PORTA, Mario Ariel. Freges ,,Logik" von 1897 und die Subjektfrage. Phainomenon, [S.l.], n. 22-23, p. 31-64, oct. 2011. ISSN 2183-0142. Available at: <http://phainomenon-journal.pt/index.php/phainomenon/article/view/279>. Date accessed: 18 nov. 2018.