RT Journal Article SR Electronic T1 In Memory: Niels Alexander Lassen December 7, 1926—April 30, 1997 JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 24N OP 24N VO 39 IS 4 A1 Friberg, Lars A1 Devous, Michael D. YR 1998 UL http://jnm.snmjournals.org/content/39/4/24N.abstract AB