Persistence of zidovudine-resistance mutations in HIV-1 isolates from patients removed from zidovudine therapy for at least 3 years and switched to astavudine-containing regimen
I. Pellegrin et al., Persistence of zidovudine-resistance mutations in HIV-1 isolates from patients removed from zidovudine therapy for at least 3 years and switched to astavudine-containing regimen, AIDS, 15(8), 2001, pp. 1071-1073