Two of the papers published in Science (October 9, 2015) relating to the discovery of ancient lakes in Gale Crater have been posted online, with the full texts available without charge.
The papers are titled: “Deposition, exhumation, and paleoclimate of an ancient lake deposit, Gale crater, Mars” and “A Habitable Fluvio-Lacustrine Environment at Yellowknife Bay, Gale Crater, Mars.”