Retroreflection : definition and measurement

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Kaituhi rangatōpū: International Commission on Illumination
Hōputu: Pukapuka
I whakaputaina: Paris : Bureau Central de la CIE, 1982
Rangatū:Publication CIE ; no. 54 (TC-2.3)
Ngā marau:
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