I highly recommend the following papers written by Mohamed Zakariya.
Music for the Eyes: An Introduction to Islamic and Ottoman Calligraphy
The Hilye of the Prophet Muhammad
Criticism in Art: The Case of Islamic Calligraphy
Rhyming in R: A Poem by Calligrapher Ibnul-Bawwab on the Science of the Pen, Ink, Writing, and Paper
Mahmud Yazir and the Beauty of the Pen
More coming soon.
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