Efek penghambat phosphodiesterase tipe 5 (sildenafil), nitric oxide-donor dan kombinasinya pada mortilitas spermatozoa manusia in vitro = The effect of type 5 phosphodiesterase infiibitor (sildenafil), nitric oxide-donor, and their combination on human spermatozoa in vitro - Siti Tersiani Kamil, author (Fakultas Kedokteran Universitas Indonesia, 2006)