Authors: E DeFreitas; B Hilliard; P R Cheney; D S Bell; E Kiggundu; D Sankey; Z Wroblewska; M Palladino; J P Woodward; H Koprowski Journal: Proc Natl Acad Sci U S A Date: 1991-04-01 Impact factor: 11.205
Authors: H Chen; A M Pesce; M Carbonari; F Ensoli; M Cherchi; G Campitelli; D Sbarigia; G Luzi; F Aiuti; M Fiorilli Journal: Eur J Epidemiol Date: 1992-03 Impact factor: 8.082