Published in Nautilus, in 1991, in volume 105, pages 1-6

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 7-15

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 26-37

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 81-91

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 119-146

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 147-151

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 159-164

Created: 2012-03-12, modified: 2012-03-12

Published in Nautilus, in 1991, in volume 105, pages 166-172

Created: 2012-03-12, modified: 2012-03-12

Published in The Nautilus, in 1991, in volume 105, issue 3, pages 116-117

Created: 2012-03-23, modified: 2012-03-23