@article {2007.04294, archivePrefix = {arXiv}, eprint = {2007.04294}, primaryClass = {astro-ph.HE}, author = {P. Cristofari and P. Blasi and E. Amato}, title = {The low rate of Galactic pevatrons}, year = {2020}, url = {http://arxiv.org/abs/2007.04294} }