衡量對步行的友好程度的指標 Cavagna GA, Heglund NC, Taylor CR. Mechanical work in terrestriallocomotion: two basic mechanisms for minimizing energy expenditure.. American
Prague, Artua, 1979. Pg. 237-8 Argot, Christine., 2002: Evolution of the locomotion in the Borhyaenoids Marsupialia, Mammalia Morphofunctional and phylogenetical