HaGra. In addition, a work known as Beurei HaGra, was written by his disciples based on his comments. Two versions of this commentary exist, based on manuscripts written by different disciples. A commentary known as the Ridvaz on nearly all the tractates of the Jerusalem Talmud was first published in Piotrków in 1898, with its companion commentary, Tosefot HaRid, by Rabbi Yaakov Dovid Wilovsky of Slutzk and later of Safed (1845–1914). In modern times, two comprehensive works have been published: Toldot Yitzchak and its companion Tevunah, by Rabbi Yitzchok Isaac Krasilschikov of Poltava, who wrote his commentary in the Soviet Union before he died in Moscow in 1965. The manuscript was smuggled out of Communist Russia by Rabbi Harry Bronstein, who founded Machon Mutzal MeiEish and published a new edition of Seder Zeraim of the Jerusalem Talmud, which included Rabbi Krasilschikov's work and all the major commentators published up to that time. Sha'arei Emunoh, the commentary of Rabbi Chaim Kanievsky to the Jerusalem Talmud has been published to date on Sedarim Zeraim and Moed. It is based on lectures given by Rabbi Kanievsky and contains explanations from earlier commentators, as well as many original insights; the volume on Demai was published in Bnei Brak, Israel, in 2002. In addition to the commentaries listed to the above, commentaries specific to tractate Demai, or to the laws of demai are the following: Kaftor VaFerach, by Rabbi Ishtori Haparchi, a disciple of the Rosh, is one of the few surviving compositions of the Rishonim concerning Seder Zeraim. Rabbi Ishtori was born in Provence in about 1280 and emigrated to the Land of Israel, where he absorbed himself in the study of the halachot applying to the Land. His work was first published in Venice in 1546. Maharam Chaviv by Rabbi Moshe ibn Chaviv of Salonika (17th century) wrote a commentary to the Jerusalem Talmud's tractate Demai, as well as to the Jerusalem Talmud's tractates Berakhot and Peah. This commentary was also named Pnei Moshe, but to distinguish it from the more well-known commentary of that name by Moshe Margolies, it is sometimes referred to as Maharam Chaviv. Extant only as a manuscript from the time of its composition, it was first published by Machon Yerushalayim in 1994. Pe'at HaShulchan is a work on the laws pertaining to agriculture, written by Rabbi Yisroel ben Shmuel of Shklov (1770–1839), a disciple of the Vilna Gaon