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	Susanne Zapf (violin) Georg Katzer - String Quartet № 4 Тempi fragili (2004) Susanne Zapf (violin) , Sonar Quartett Year of publication: 2010. (0) Georg Katzer - String Quartet № 1 (1965) Susanne Zapf (violin) , Sonar Quartett Year of publication: 2010. (3) Georg Katzer - String Quartet № 3 (1987) Susanne Zapf (violin) , Sonar Quartett Year of publication: 2010. (0)