A paper by Linguistics PhD student Yushi Sugimoto titled “Labeling Defective T*” was recently published online in Studia Linguistica.
From the abstract: This paper proposes a new analysis of so-called ‘defective T’ (a postulate originally discussed in Chomsky 2000, 2001) and seeks a label-based theoretical explanation of phenomena associated with the distribution of subjects in infinitival clauses.