Gardner & Schmidt 1988. Cestodes of the genus Hymenolepis Weinland, 1858 sensu stricto from pocket gophers Geomys and Thomomys spp. (Rodentia: Geomyidae) in Colorado and Oregon, with a discriminant analysis of four species of Hymenolepis. Canadian Journal of Zoology, 66(4) 1988: 896-903