From the introduction: "This paper attempts to reconstruct a proto-language whose reflexes are Binukid and Dibabaon-Mandayan, both of the Malayo-Polynesian family, and both spoken on the island of Mindanao of the Philippines."
Stark, Donald S.
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 5, Article 14.
Available at: https://commons.und.edu/sil-work-papers/vol5/iss1/14