以下Unicode文档记录了定义片假名语音扩展区块中特定字符的目的与过程:
更多信息 版本, 最终码位[a] ...
| 版本 | 最终码位[a] | 码位数 | L2 ID | WG2 ID | 文档 | 
| 3.2 | U+31F0..31FF | 16 | L2/99-238 |  | Consolidated document containing 6 Japanese proposals, 1999-07-15 | 
|  | N2092 (页面存档备份,存于互联网档案馆) | Addition of forty eight characters, 1999-09-13 | 
| L2/99-365 |  | Moore, Lisa, Comments on JCS Proposals, 1999-11-23 | 
| L2/00-024 |  | Shibano, Kohji, JCS proposal revised, 2000-01-31 | 
| L2/99-260R |  | Moore, Lisa, JCS Proposals, Minutes of the UTC/L2 meeting in Mission Viejo, October 26-28, 1999, 2000-02-07 | 
| L2/00-297 | N2257 (页面存档备份,存于互联网档案馆) | Sato, T. K., JIS X 0213 symbols  part-1, 2000-09-04 | 
| L2/00-342 | N2278 (页面存档备份,存于互联网档案馆) | Sato, T. K.; Everson, Michael; Whistler, Ken; Freytag, Asmus, Ad hoc Report on Japan feedback N2257 and N2258, 2000-09-20 | 
| L2/01-050 | N2253 (页面存档备份,存于互联网档案馆) | Umamaheswaran, V. S., 7.16 JIS X0213 Symbols, Minutes of the SC2/WG2 meeting in Athens, September 2000, 2001-01-21 | 
| L2/01-114 | N2328 (页面存档备份,存于互联网档案馆) | Summary of Voting on SC 2 N 3503, ISO/IEC 10646-1: 2000/PDAM 1, 2001-03-09 | 
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