However, due to lack of comments regarding the sources for the Second Collection, many documents which passed through Firkovich's hands were promoted as skeptic among some Hebraists (Chwolson, S. L. Rapoport, A. Neubauer, Julius Fürst, Heinrich Grätz, Strack and Harkavy etc.).
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Further exposures were made by Strack and Harkavy (St. Petersburg, 1875) in the Catalog der Hebr. Bibelhandschriften der Kaiserlichen Oeffentlichen Bibliothek in St. Petersburg; in Harkavy's Altjüdische Denkmäler aus der Krim (ib. 1876); in Strack's A. Firkowitsch und Seine Entdeckungen (Leipsic, 1876); in Fränkel's Aḥare Reshet le-Baḳḳer (Ha-Shaḥar, vii. 646 et seq.); in Deinard's Massa' Ḳrim (Warsaw, 1878); and in other places.
Friedrich Strack, full name Christian Friedrich Leberecht Strack (May 1781, Roßleben – 25 July 1852, Bremen) was a German naturalist.
Strack went on to become a success in Northwest Indiana, and the chain is currently known as Strack & Van Til.