1. Animals in motion;Muybridge,1957
2. The human figure in motion;Muybridge,1955
3. Symmetrical gaits of horses;Hildebrand;Science,1965
4. Analysis of the symmetrical gaits of tetrapods;Hildebrand;Fol. Biotheoret.,1966
5. A general theoretical model of creeping displacement;Tomovic;Cybernetica,1961