title: Unified coordinate system for retroreflectance measurements.
abstract: A geometric system for universal use in specifying and measuring retroreflectance is described. This system has been developed by the Subcommittee on Retroreflectance of CIE Committee 2.3 on Properties of Materials and is to be considered for adoption as part of a recommended practice.
authors.forename: W H
authors.initials: WH
authors.lastname: Venable
authors.forename: N L
authors.initials: NL
authors.lastname: Johnson