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Variational Principle for Eigenvalue Problems of Hamiltonian Systems
R. D. Benguria and M. C. Depassier
Phys. Rev. Lett. 77, 4482 (1996)
Vortex Dynamics in Two-Dimensional Amorphous Mo<sub>77</sub>Ge<sub>23</sub> Films
M. C. Hellerqvist, D. Ephron, W. R. White, M. R. Beasley, and A. Kapitulnik
Phys. Rev. Lett. 77, 4482 (1996)