In the Encyclopaedia Judaica article written by Professor Gershom Scholem of the Hebrew University of Jerusalem there is an extensive discussion of the sources cited in the Zohar. Scholem views the author of the Zohar as having based the Zohar on a wide variety of pre-existing Jewish sources, while at the same time inventing a number of fictitious works that the Zohar supposedly quotes, "e.g.", the Sifra de-Adam, the Sifra de-Hanokh, the Sifra di-Shelomo Malka, the Sifra de-Rav Hamnuna Sava, the Sifra de-Rav Yeiva Sava, the Sifra de-Aggadeta, the Raza de-Razin and many others.