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MathSciNet bibliographic data
MR1873011 37J45 (35Q53 37K99 70H50 93B27)
van den Berg, J. B.; Vandervorst, R. C. Second order Lagrangian twist systems: simple closed characteristics. Trans. Amer. Math. Soc. 354 (2002), no. 4, 1393–1420 (electronic).
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