Bulletin of the American Mathematical Society · 1939 · 181 citations · 9 references
Natural SciencesGeophysicsDynamical SystemsFluid DynamicsGravityContinuity EquationGeodesic MotionGeodesic EquationsGeodesic FlowsLagrangian Formulation Of Geodesic Motion
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Fred W. Perkins, Lester R. Ford · American Mathematical Monthly · 1930 · 317 citations
Fuchsian groups and transitive horocycles
Gustav A. Hedlund · Duke Mathematical Journal · 1936 · 186 citations
Gustav A. Hedlund · Annals of Mathematics · 1939 · 38 citations