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Time: 2024-03-29T08:17:21Z
URL: http://scholar.google.com/scholar_lookup?title=Production+of+high-titer+helper-free+retroviruses+by+transient+transfection&year=1993&author=Pear&journal=Proc.+Natl.+Acad.+Sci.+U.+S.+A.&volume=90&pages=8392-8396&doi=10.1073%2Fpnas.90.18.8392&pmid=7690960