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

O'Mara, Philip F. "Holcot 'Ecumenism' and the Pearl-Poet." 27 (1992): 97-106. (The title in the table of contents for that issue is "Robert Holcot's 'Ecumenism' and the Green Knight, Part II.")
The Pearl-Poet presents the Green Knight in such a way that he evokes a number of principles from Holcot's Moralitates. The preponderance of such occurrences and evidence surrounding the poem suggest that the Pearl-Poet knew Holcot personally. Certainly the Pearl-Poet's views make him likely to accept without question the story presented in St. Erkenwald.