1. ISO TC 172 SC 9 WG 1:Standard for the Measurement of Beam Widths, Beam Divergence, and Beam Propagation Factor; at this writing the document is numberedN38 Revised dated 2-18-92.
2. Copies of N38 Revised 2-18-92 are available from: Dr. K. Gindele, DIN Deutsches Institut fur Normung e.V., Außenstelle Pforzheim, Westliche 56, D-7530 Pforzheim, Germany; Tel. +49 72 31 91 88 22; Fax. +49 72 31 35 92 00.