Zhen et al. 2014, hlm. 2237–2250. Zhen, S.; Huang, K.; Zhao, H.; Chen, Y.H. (2014). "Why can a free-falling cat always manage to land safely on its feet?". Nonlinear Dynamics. 79 (4): 2237–2250. doi:10.1007/s11071-014-1741-2. S2CID120984496.
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Zhen et al. 2014, hlm. 2237–2250. Zhen, S.; Huang, K.; Zhao, H.; Chen, Y.H. (2014). "Why can a free-falling cat always manage to land safely on its feet?". Nonlinear Dynamics. 79 (4): 2237–2250. doi:10.1007/s11071-014-1741-2. S2CID120984496.