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21.
Els van der Aa 《Celestial Mechanics and Dynamical Astronomy》1983,31(2):163-191
Hamiltonian systems with three degrees of freedom which have a resonance-ratio 1∶2∶ω with ω=1, 2, 3, or 4 are studied here. The periodic orbits are determined together with their stability characteristics. Furthermore we shall study the fundamental question of asymptotic integrability of these systems. 相似文献
22.
Placer formation and placer minerals 总被引：1，自引：0，他引：1