Aa. Dzhumabayeva et Al. Kunitsyn, The stability of periodic Hamiltonian systems with multiple fourth-order resonance, J APPL MA R, 62(5), 1998, pp. 699-703
The problem of the stability of the periodic motion of a non-linear periodi
c Hamiltonian system is considered in the case of pure imaginary characteri
stic exponents which also satisfy several fourth-order resonance conditions
. Conditions for stability and instability are formulated based on terms of
the third order inclusive. Some conclusions generalize results obtained pr
eviously [1]. (C) 1999 Elsevier Science Ltd. All rights reserved.