by Perls, Thomas T., Wilmoth, John, Levenson, Robin, Drinkwater, Maureen, Cohen, Melissa, Bogan, Hazel, Joyce, Erin, Brewster, Stephanie, Kunkel, Louis, Puca, Annibale
Published in Proceedings of the National Academy of Sciences - PNAS (11.06.2002)

by Evert, Jessica, Lawler, Elizabeth, Bogan, Hazel, Perls, Thomas
Published in The journals of gerontology. Series A, Biological sciences and medical sciences (01.03.2003)