Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) PACKER RJ,Early cystic/necrotic change after hypofractionated radiation therapy in children with brain stem gliomas : Data from the childrens cancer group,Cancer,,,1993,71,,2666-2674,https://cir.nii.ac.jp/crid/1570291225103203968,