Published in Zoological Science, in 1994, in volume 11, pages 511-515

Created: 2012-09-19, modified: 2012-09-19

Published in Biol Bull, in 1969, in volume 137, pages 297-311

Created: 2010-01-06, modified: 2011-06-21

Published in Biol Bull, in 1981, in volume 161, pages 172-179

Created: 2010-01-07, modified: 2011-06-21

Published in Mammal Study, in 1999, in volume 24, pages 43-50

Created: 2014-09-25, modified: 2014-09-25