@article{article3e43517d,
title   = {The spiral structure of the Galaxy revealed by CS sources and evidence for the 4:1 resonance},
author = {Lépine, Jacques Raymond Daniel and Roman-Lopes, A and Abraham, Zulema and Junqueira, T. C and Mishurov, Yu. N},
year = {2011},
doi = {10.1111/j.1365-2966.2011.18492.x},
journal   = {Monthly Notices of the Royal Astronomical Society}
}