1. Notes on the description of English questions: the role of an abstract question morpheme;Baker;Foundations of Language,1970
2. Grammatik des deutschen Verbs;Bierwisch;Studia Grammatica,1963
3. On instrumental adverbs and the concept of deep structure;Bresnan;MIT Laboratory of Electronics,1969
4. Une syntaxe transformationnelle de l'adverbe allemand;Faucher;La Linguistique,1971