Found:

SUBJECT

SYNTAX: the subject of an infinitive, an NP or a small clause is a SUBJECT, as well as INFL (AGR) of a finite clause. This notion of SUBJECT is invoked to entail that AGR of a finite clause creates a governing category, and that NP is a governing category only if it has a subject (e.g. John's story about himself).

LIT.	Chomsky, N. (1981)