[Reports] / Amer.inst.of aeronautics and astronautics. N 90-3822 : Advanced propulsion options for human exploration of Mars : Rep.presented at AIAA space programs and technologies conf.,Sept.25-28,1990,Huntsville(Al) / B.Cothran,B.Tillotson,B.Donahue, 1990. - 11 p. - Текст : непосредственный.