[...] Verb Movement is an instance of head movement that obeys the Head Movement Constraint (HMC) formulated by Chomsky [Chomsky, N., 1986a, "Barriers", MIT Press, Cambrige, p. 71]: (41) Movement of a zero-level category β is restricted to the position of a head α that governs the maximal projection γ of β, where α θ-governs or L-marks γ if α ≠ Comp.
- Pollock (2004), a pag.281