David Ruffolo. (2015) Cosmic ray variations and related astrophysical processes. Mahidol University:ม.ป.ท.David Ruffolo. 2015. Cosmic ray variations and related astrophysical processes. ม.ป.ท.:Mahidol University;David Ruffolo. Cosmic ray variations and related astrophysical processes. ม.ป.ท.:Mahidol University, 2015. Print.