There are two kinds of relative clauses, i.e. Head External and Head Internal. The pivotal relative clauses are Head External in the languages of the world, while quite many languages utilize Head Internal Relative Clauses in which Head is inside the TP of the relative clause. In order to explain Head Internal relative Clauses, we can utilize a theory of Grafts advocated by Riemsdijk, and show that Graft can well explain numeral expressions in Head Internal Relative Clauses.
隆 今井 (Tue,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: