The linker in Nǀuu appears before various types of nominal expressions, but not before the second object in a double object construction. Linkers in Khoisan languages such as ǂHoan and Juǀ'hoansi do appear in this position. I will show that this property of the linker in Nluu is related to the fact that Nluu has a dative Case marker -a which appears after the first object of a DOC, whereas ǂHoan and Juǀ'hoansi do not.
Collins, Chris. 2004. The Absence of the Linker in Double Object Constructions in N|uu. Studies in African Linguistics, 33.2.