The hunt for planet X new worlds and the fate of Pluto - Schilling, Govert-; SpringerLink (Online service) (New York, NY : Springer Science+Business Media, LLC, 2009)
Keywords: Planets -- Discovery and exploration -- Popular works; Outer planets -- Discovery and exploration -- Popular works; Astronomy -- History -- Popular works; Physics; Astronomy; Popular Science in Astronomy; Planetology; Solar system -- Discovery and exploration -- Popular works