Authors: R B Firestone; A West; J P Kennett; L Becker; T E Bunch; Z S Revay; P H Schultz; T Belgya; D J Kennett; J M Erlandson; O J Dickenson; A C Goodyear; R S Harris; G A Howard; J B Kloosterman; P Lechler; P A Mayewski; J Montgomery; R Poreda; T Darrah; S S Que Hee; A R Smith; A Stich; W Topping; J H Wittke; W S Wolbach Journal: Proc Natl Acad Sci U S A Date: 2007-09-27 Impact factor: 11.205