TY - JOUR AU - Franzen, Douglas AU - Kim, E. C2 - Optics Letters DA - 1981-04-01 00:04:00 LA - en M1 - 20 PB - Optics Letters PY - 1981 TI - Results of an Inter-Laboratory Measurement Comparison to Determine the Radiation Angle (NA) of Graded Index Optical Fibers ER -