"Journal of Geophysical Research", 1966; vol.71(19): 4535-* Murphy CH, Bull GV, Wright JW: "Motions of an electron-ion cloud released at 100 kilometers from a gun-launched projectile".
"Journal of Geophysical Research", 1966; vol.71(19): 4535-* Murphy CH, Bull GV, Wright JW: «Motions of an electron-ion cloud released at 100 kilometers from a gun-launched projectile».