@article{article142ee039,
title   = {Dynamic portrait of the planetary 2/1 mean-motion resonace: I. systems with a more massive outer planet},
author = {Michtchenko, Tatiana Alexandrovna and Beauge, C and Ferraz-Mello, Sylvio},
year = {2008},
doi = {10.1111/j.1365-2966.2008.13278.x},
journal   = {Monthly Notices of the Royal Astronomical Society}
}