以下Unicode文檔記錄了定義片假名語音擴展區塊中特定字符的目的與過程:
更多資訊 版本, 最終碼位[a] ...
| 版本 | 
最終碼位[a] | 
碼位數 | 
L2 ID | 
WG2 ID | 
文檔
 | 
| 3.2 | 
U+31F0..31FF | 
16 | 
L2/99-238 | 
 | 
Consolidated document containing 6 Japanese proposals, 1999-07-15
 | 
 | 
N2092 (頁面存檔備份,存於互聯網檔案館) | 
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 (頁面存檔備份,存於互聯網檔案館) | 
Sato, T. K., JIS X 0213 symbols  part-1, 2000-09-04
 | 
| L2/00-342 | 
N2278 (頁面存檔備份,存於互聯網檔案館) | 
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 (頁面存檔備份,存於互聯網檔案館) | 
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 (頁面存檔備份,存於互聯網檔案館) | 
Summary of Voting on SC 2 N 3503, ISO/IEC 10646-1: 2000/PDAM 1, 2001-03-09
 | 
| 
 | 
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