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Yu. Ilyashenko, “Germs of bifurcation diagrams and SN-SN families”, Chaos, 31:1 (2021), 013103
Nataliya Goncharuk, Yury Kudryashov, “Bifurcations of the polycycle “tears of the heart”: multiple numerical invariants”, Mosc. Math. J., 20:2 (2020), 323–341
N. B. Goncharuk, Yu. S. Ilyashenko, “Various Equivalence Relations in Global Bifurcation Theory”, Proc. Steklov Inst. Math., 310 (2020), 78–97