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2. On the generation of sets of subharmonic modes in piece wisecontinuous systems.;Feigin;PMM,1974
3. On the behavior of dynamic systems in the vicinity of existence boundaries of periodic motions;Feigin;PMM,1977
4. The existence of cycles of continuous transformation of a straight line into itself;Sharkovskii;Ukr. Matem. Zh.,1964
5. Simple mathematical models with very complicated dynamics;May;Nature,1976