The Chaucer Review: An Indexed Bibliography (Vols. 1-30)

Edwards, A. S. G., and Linne R. Mooney. "Is the Equatorie of the Planets a Chaucer Holograph?" 26 (1991): 31-42.
The fact that the Equatorie of the Planetis was prepared on vellum with carefuly drawn and colored illustrations and that the insertions seem to correct scribal errors suggest that this text is not a holograph of any author. Scientific texts were often written at universities by those using less-formal script. Given the uncertainty of the holographic nature of the text, it is difficult to assert that Chaucer was the writer.