At the end of the 90ies Bondarenko's late daughter gave that archive Nikolai Griva (Dnepropetrovsk) for using in publications. In 2008 Griva supplied this picture for the sake of free use.
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{{Information |Description={{en|1=Samuel Isenegger, study composer from Switzerland}} {{de|1=Samuel Isenegger, Studienkomponist aus der Schweiz}} |Source=Archiv Bondarenko |Author=unknown |Date=before 1965 |Permission=At the end of the 90ies Bondarenko's