@ARTICLE{
author={Kovacic Ivana N,Rand Richard H,Sah Si Mohamed},
year={2018},
title={Mathieu's Equation and Its Generalizations: Overview of Stability Charts and Their Features},
journal={APPLIED MECHANICS REVIEWS},
volume={70},
number={2},
pages={-},
document_type={Review},
} 

@ARTICLE{
author={Kovacic Ivana N,Rand Richard H},
year={2013},
title={About a class of nonlinear oscillators with amplitude-independent frequency},
journal={NONLINEAR DYNAMICS},
volume={74},
number={1-2},
pages={455-465},
document_type={Article},
} 

@ARTICLE{
author={Kovacic Ivana N,Rand Richard H},
year={2013},
title={Straight-line backbone curve},
journal={COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION},
volume={18},
number={9},
pages={2281-2288},
document_type={Article},
}