@phdthesis{ Solr-4137483, title = {Azimuthal propagation of low-energy solar-flare protons as observed from spacecraft very widley separted in solar azimuth.}, author = {McKibben, R. Bruce, 1943-}, year = {1972}, school = {Thesis (Ph.D.)--Univ. of Chicago, Department of Physics, June 1972.}, pages = {3984}, note = {"Reprinted from Journal of geographical research, 77, no. 22 (August 1, 1972), 3957-3984."}, }