2. none
3. none
4. http://boneandspine.com/normal-gait-cycle/
6. https://www.physio-pedia.com/Running_Biomechanics
7. none
8. https://podiapaedia.org/wiki/biomechanics/gait/determinants-of-gait/
9. https://www.physio-pedia.com/Trendelenburg_Gait
10. none
11. none
12. https://www.orthobullets.com/foot-and-ankle/7001/gait-cycle
13. http://emedicine.medscape.com/article/320160-overview#aw2aab6b2
14. http://emedicine.medscape.com/article/320160-overview#aw2aab6b2
15. http://emedicine.medscape.com/article/320160-overview#aw2aab6b2
16. http://emedicine.medscape.com/article/320160-overview#aw2aab6b2
17. http://www.oandplibrary.org/alp/chap26-01.asp
18. https://podiapaedia.org/wiki/biomechanics/gait/determinants-of-gait/
19. http://patient.info/doctor/abnormal-gait
20. none
21. https://academic.oup.com/milmed/article/181/suppl_4/30/4209437
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3645289/
https://academic.oup.com/milmed/article/181/suppl_4/30/4209437
22. none