Williams, Simon J C, From Wolfram to Wagner and Beyond: Sexuality, Freedom, and the Avoidance of Tragedy in 'Parsifal', Arthuriana, 11.1, 2001, 11-29

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Rezeption (sekundär - Neuzeit):

Wagner, Richard: , 179,22 (14), 202,29-203,10 (14-15), 238,21-238,24 (15), 802,1-802,10 (17)