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Books about Gikatilla:
Rabbi Joseph Gikatilla's Hermeneutics (Texts and Studies in Medieval and Early Modern Judaism) by Elke Morlok (Dec 31, 2011)
R. Joseph Gikatilla's Commentary to Ezekiel's Chariot (Sources and Studies in the Literature of Jewish Mysticism... by Asi Farber-Ginat (1998)
Wiki information Gikatilla:
Joseph ben Abraham Gikatilla was a Spanish kabbalist, student of Abraham Abulafia.