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Dubnow, "History of the Hasidic Schism," Voskhod, 1890-1891.
Fünn, Kiryah Neemanah (history of the Vilna community), Vilna, 1860, pp. 27, 130, 273.
Katz, "History of the Haskalah Movement in Russia," Ha-Zeman, 1903, vol. I, pp. 97-102.
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Paperna, article on Hirshovitz's memorandum, Voskhod, Book VI, 1902.
Kraszewski, Polska w czasie trzech rozbiorów ("Poland during the Time of the Three Partitions"), vol. II, pp. 318-320; vol. III, pp. 108, 122 [P].
Gumplowicz, Stanislawa Augusta proekt reformy żydowstwa ("Stanislav Augustus' Project of Jewish Reform"), Cracow, 1875 [P].
Deiches, Sprawa żydowska podezas Sejmu Weilkiego ("The Jewish Cause at the Time of the Great, or Quadrennial Diet"), 1891.
Luninski, Berek Joselwicz, Warsaw, 1909 [P]. Comp. Yevr. St., 1909, vol. II, p. 128 et seq.