@article {fonda2012,
	title = {Periodic solutions of a system of coupled oscillators with one-sided superlinear retraction forces},
	journal = {Differential Integral Equations},
	volume = {25},
	number = {11/12},
	year = {2012},
	month = {11},
	pages = {993{\textendash}1010},
	publisher = {Khayyam Publishing, Inc.},
	url = {https://projecteuclid.org:443/euclid.die/1356012248},
	author = {Alessandro Fonda and Andrea Sfecci}
}
