Pseudogapping was first identified , named , and explored by Stump ( 1977 ) .
Pseudogapping was first has since been studied in detail by Levin ( 1986 ) among others , and now enjoys a firm position in the canon of acknowledged ellipsis mechanisms of English .
Pseudogapping was first identified , named , and explored by Stump ( 1977 ) and has since been studied in detail by Levin ( 1986 ) among others , and now enjoys a firm position in the canon of acknowledged ellipsis mechanisms of English .