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Families of periodic solutions of systems having relatively invariant line integrals
(The Johns Hopkins University, 1954-06-20)
Recent work on families of periodic solutions of differential equations
(The Johns Hopkins University, 1959-06-30)
On the role of first integrals in the perturbation of periodic solutions
(The Johns Hopkins University, 1955-04-01)
On a conjecture of Montgomery
(1957-06)
Periodic solutions of differential equations containing a parameter
(The Johns Hopkins University, 1953-12-18)