@article {1907.05412,
archivePrefix = {arXiv},
eprint = {1907.05412},
primaryClass = {math-ph},
author = {Jesús Muñoz-Díaz and Ricardo J. Alonso-Blanco},
title = {A mathematical objection to the existence of relativistic mechanical systems of several particles},
year = {2019},
url = {http://arxiv.org/abs/1907.05412}
}