Impulsive, stochastic and shock wave acceleration of relativistic protons in large solar events of 1989 September, 29, 2000 July 14, 2003 October 28, and 2005 January 20

J. Pérez-Peraza, E.V. Vashenyuk, L.I. ,Miroshnichenko, Yu. V. Balabin, A. Gallegos-Cruz
Astrophysical Journal 695, 865-873, 2009 (doi 10.1088/0004- 637X/695/2/2/865)