Li, Tien-Yien; Yorke, James A. (1975년 12월). “Period Three Implies Chaos”. 《American Mathematical Monthly》 (영어) 82 (10): 985–992. doi:10.2307/2318254. JSTOR2318254.
Bendixson, Ivar (1901). “Sur les courbes définies par des équations différentielles”. 《Acta Mathematica》 (프랑스어) 24 (1): 1–88. doi:10.1007/BF02403068.
Kolmogorov, A. N. (1954). “Preservation of conditionally periodic movements with small change in the Hamiltonian function”. 《Doklady Akademii Nauk SSSR》. Lecture Notes in Physics 98: 527–530. Bibcode:1979LNP....93...51K. doi:10.1007/BFb0021737. ISBN3-540-09120-3.
Kolmogorov, A. N. (1954). “Preservation of conditionally periodic movements with small change in the Hamiltonian function”. 《Doklady Akademii Nauk SSSR》. Lecture Notes in Physics 98: 527–530. Bibcode:1979LNP....93...51K. doi:10.1007/BFb0021737. ISBN3-540-09120-3.