This paper investigates the differences in distribution between weak and strong NPIs in English. It is proposed that both weak and strong NPIs are licensed by Downward Entailing (DE) operators; but that weak NPIs only pay attention to the truth-conditional content of their licensers, while strong NPIs must pay attention to non-truthconditional meaning as well in their search for a DE licenser.
"Licensing strong NPIs,"
University of Pennsylvania Working Papers in Linguistics:
1, Article 13.
Available at: http://repository.upenn.edu/pwpl/vol14/iss1/13