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He was the author of Toldot Rabbi Akiva, a biography of the Tanna Rabbi Akiva (Lemberg, 1871; see Ha-Shaḥar, ii.399-400), and of the German work Mohamed nach Talmud und Midrash (issued in parts, Berlin, 1875; Vienna, 1877–80; see Sprenger in Z.D.M.G. xxix.654-659).
He also wrote in Hebrew a biography of the Königswarter family entitled Toledot Bet Königswarter (Vienna, 1877); Anshe Shem, biographies of Jonathan Eybeschütz and Solomon Munk (Lyck, 1879); and Toledot Yellineḳ, a biography of Adolph Jellinek (Brody, 1880).
- Chaim David Lippe, Bibliographisches Lexicon, i.129, 600, Vienna, 1881
- William Zeitlin, Bibl. Post-Mendels., p. 107;
- Moise Schwab, Répertoire, Paris, 1900; ib. Supplement, 1903.
- This article incorporates text from a publication now in the public domain: Executive Committee of the Editorial Board, Peter Wiernik (1901–1906). "Isaac Gastfreund". In Singer, Isidore; et al. Jewish Encyclopedia. New York: Funk & Wagnalls Company.
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