Published in Nautilus, in 2007, in volume 121, pages 17-28

Published in Nautilus, in 2007, in volume 121, pages 76-89

Published in Nautilus, in 2007, in volume 121, pages 90-94

Published in Nautilus, in 2007, in volume 121, pages 95-98

Published in Nautilus, in 2007, in volume 121, pages 99-103

Published in Nautilus, in 2007, in volume 121, pages 105-130

Published in Nautilus, in 2007, in volume 121, pages 159-162

Published in Nautilus, in 2007, in volume 121, pages 163-181

Published in Nautilus, in 2007, in volume 121, pages 191-200

Published in Nautilus, in 2007, in volume 121, pages 201-209

Published in Nautilus, in 2007, in volume 121, pages 210-213

Published in Nautilus, in 2007, in volume 121, issue 4, pages 182-190