Circular symmetry and the trace formula

Periodic Orbits and Classical Quantization Conditions

Martin C. Gutzwiller · Journal of Mathematical Physics · 1971 · 1.5K citations

Natural Sciences, Physics, Differential Equations +16

The spectrum of positive elliptic operators and periodic bicharacteristics

J. J. Duistermaat, Victor Guillemin · Inventiones mathematicae · 1975 · 616 citations

Natural Sciences, Mathematics, Physics +12

On the Morse index in variational calculus

J. J. Duistermaat · Advances in Mathematics · 1976 · 265 citations

Natural Sciences, Mathematics, Differential Equations +11

Minimal coupling and the symplectic mechanics of a classical particle in the presence of a Yang-Mills field

Shlomo Sternberg · Proceedings of the National Academy of Sciences · 1977 · 212 citations · Full text

Natural Sciences, Mathematics, Physics +17

Asymptotics of eigenvalue clusters for the Laplacian plus a potential

Alan Weinstein · Duke Mathematical Journal · 1977 · 198 citations

Natural Sciences, Biophysics, Complex Systems +9