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R. Falk also wrote Kunteres al ha-Ribbit (1692) on the laws of interest promulgated by the Council of the Four Lands in 1607. Several of his numerous responsa have been published in various collections (Ge'onei Batra'ei, Bayit Hadash, Masot Binyamin). He wrote novellae on 14 tractates of Isaac Alfasi (the Rif) and on the commentary to it by Nissim b. Reuben Gerondi (the Ran), expositions on the Kabbalah and philosophy, and several other works, all of which were destroyed in a fire in Lemberg.
על-פי פראג שע"ד-שע"ה, בהשמטת ההקדמה ודברי-הסיום של המגיה. במקום ההקדמה נדפס דגל-מדפיס ובו: "משפחת הגרשוני", ממנה הועבר הדגל למדפיס משה כ"ץ. עיין: א. יערי, דגלי המדפיסים העבריים, ירושלים תש"ד, עמ' 27 ועמ' 140, ציור 43.