On the classification of increases in the intensity of cosmic rays (GLE)

Pérez-Peraza J., Libin I., Juárez Zúñiga, A., Zapotitla Román, J. , Alvarez Madrigal, M.
Cosmic rays Series № 29, Ed. Maok, ISBN: 978-5-905114-14-4, p. 244-250, 2014.