@article{article6cbc972d,
title   = {Maslov index and Morse theory for the relativistic Lorentz force equation},
author = {Caponio, Erasmo and Masiello, Antônio and Piccione, Paolo},
year = {2004},
doi = {10.1007/s00229-004-0441-5},
journal   = {Manuscripta Mathematica}
}