Evidence for a Yaguan-Zaparoan connection

From the introduction: This paper examines preliminary evidence regarding the type of the relationship obtaining between Peba-Yaguan and Zaparoan languages. My tentative conclusions are that certain features shared by the Peba-Yaguan and Zaparoan families may be due to a genetic connection, though independent origin cannot be ruled completely out. These features include phonological phenomena, certain transitivity-related verbal suffixes, and postpositional counterparts of some such suffixes