Ïîäïèñü: http://www.gpntb.ru/win/ntb/ntb96/7/file3.html                                                                

Ïîäïèñü:   http://libconfs.narod.ru/2002/9s/s9_p8.htm                                                                                                                                                                                                           

Ïîäïèñü: http://www.library.ru/1/kb/articles/article.php?a_uid=298                                                                                                                                                                                                 Â ÐÀÇÄÅËÛ