Manuel Abellanas Ferran Hurtado Christian Icking Rolf Klein Elmar Langetepe Lihong Ma Belén Palop Vera Sacristan Smallest Color-Spanning Objects. 278-289 2001 conf/esa/2001 ESA http://link.springer.de/link/service/series/0558/bibs/2161/21610278.htm db/conf/esa/esa2001.html#AbellanasHIKLMPS01