@article{ayala2011isochronous,
author = "V. Ayala and W. Kliemann and F. Vera",
title = "Isochronous sets of invariant control systems",
year = 2011,
journal = "Systems \& Control Letters",
publisher = "Elsevier",
volume = 60,
number = 12,
pages = "937-942",
doi = "10.1016/j.sysconle.2011.07.002",
url = "https://doi.org/10.1016/j.sysconle.2011.07.002"
}