Why can't I find any reference to the 11th century Arabic book "The Book of Mad Desire for the Knowledge of Written Symbols" referenced in the article?
It's Ibn Wahshiyya's Kitāb Shawq al-mustahām fī maʿrifat rumūz al-aqlām ("The Book of the Desire of the Maddened Lover for the Knowledge of Secret Scripts"), on hieroglyphics.
