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| Code | Title | Time | Year | City, Country | Instrument |
| 10.01 | Duo obs: work commissioned by Sonia Born and Georg Scheuermann; Edition Savart |
6’00 | 26-06-1987 | Brasília, Brazil | female voice, viola |
| 10.02 | Fischer, Der obs: work commissioned by the Tenor Aldo Baldin; trsc. 11.04; lyrics by Goethe; translation "The Fisherman"; Edition Savart |
8’00 | 26-06-1984 | Baden-Baden, Germany | middle voice, organ |