Schafer (1995)

• Schafer, R. 1995, ‘Negation and Verb Second in Breton.’, Natural Language and Linguistic Theory 13, 135-172.

 This paper provides an analysis of Breton phrase structure and examines its 
 consequences for the reformulation of the ECP in Rizzi (1990b). Particularly, I argue
  that subjects must be antecedent governed. I demonstrate that a number of aspects of 
 Breton syntax, particularly subject agreement phenomena in V2 root clauses, are 
 thus explained. In the course of the argument, I present an alternative to the standard
  analysis of the language, in which I treat V2 not as an absolute characterization
  of a language containing certain rules, but rather as one relative to the 
 instantiation of an abstract feature [Aff] (see Laka 1990) and the nature of C° 
 (Platzack 1986, Rizzi 1990a).