@ARTICLE{
author={Navarro Helio A,Cveticanin Livija J},
year={2018},
title={Extension of the Hamiltonian Approach with General Initial Conditions},
journal={JOURNAL OF THEORETICAL AND APPLIED MECHANICS},
volume={56},
number={1},
pages={255-267},
document_type={Article},
} 

@ARTICLE{
author={Navarro Helio A,Cveticanin Livija J},
year={2016},
title={Amplitude-frequency relationship obtained using Hamiltonian approach for oscillators with sum of non-integer order nonlinearities},
journal={APPLIED MATHEMATICS AND COMPUTATION},
volume={291},
number={},
pages={162-171},
document_type={Article},
}