Published in Nautilus, in 1997, in volume 110, pages 76
Published in Nautilus, in 1997, in volume 110, pages 94-96
Published in The Nautilus, in 1997, in volume 110, pages 97-101
Published in Nautilus, in 1997, in volume 110, pages 122-138
Published in Nautilus, in 1997, in volume 110, issue 3, pages 77-93