A varying form of the series symbol that might reasonably be sought by a user.
Its function is to generate a cross reference which prints in the United Nations
Document Series Symbols and directs the user to the authorized symbol.
Examples:
190 $b ACC/ACCIS/
490 $a ACCIS/
[displayed as "See: [ACC/]ACCIS/"]
690 $a [ACC/]ACCIS/
190 $b ST/ESA/
490 $a ESA/
[displayed as "See: ST/ESA/"]
690 $a ST/ESA/
190 $b E/ECE/CES/AC.68
490 $a CES/AC.68/
[displayed as "See: [E/ECE/]CES/AC.68/"]
690 $a [E/ECE/]CES/AC.68/
190 $b ST/DPI/PRESS/UPU
490 $a UPU/
[displayed as "See: [ST/DPI/PRESS/]UPU/" ]
690 $a [ST/DPI/PRESS/]UPU/
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