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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html><head> <title>Bulgarian Chemical Communications</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta http-equiv="Content-Language" content="en-us"> <meta name="description" content=""> <meta name="keywords" content=""> <meta name="author" content="Boyan Ivanov"> <meta name="robots" content="index, follow"> <meta name="revisit-after" content="1 months"> <base target="_top"> <style type="text/css">  </style> </head> <body> <table width="989" height="599" border="1" align="center" bgcolor="#DFDFDF"> <tr> <td height="23"><div align="center"><span class="style4"><span class="style16">BULGARIAN CHEMICAL COMMUNICATIONS</span><br /> <span class="style20">Journal of the Chemical Institutes of the Bulgarian Academy of Sciences and of the Union of Chemists in Bulgaria </span></span></div></td> </tr> <tr> <td width="979" height="23"><div align="center"><span class="style26">Editor-in-Chief:<em> V. Beschkov</em></span> </div></td> </tr> <tr> <td height="21"> <div align="center"> <script language="JavaScript"> document.write('<STYLE type="text/css">'); document.write('#menuspan269 { position:absolute; width:808px; }'); document.write('#menutable269 { border-width: 0px; border-color: #808080; border-style:solid}'); document.write('td.menucell269 { padding:2px; padding-left:4px; padding-right:4px; background:#97E2CC; border:0px groove #D3E5B7; text-align:CENTER; }'); document.write('#submenutable269 { background: #D9AEE2; border-width: 0px; border-color: #000000; border-style:solid}'); document.write('td.topcell269 {text-decoration:none; color:#4446BA; font-weight: 700; font-family: Verdana; font-size: 12px; font-style:normal; text-align:CENTER; }'); document.write('a.topitem269 {text-decoration:none; color:#4446BA; font-weight: 700; font-family: Verdana; font-size: 12px; font-style:normal; } '); document.write('a.topitem269:hover {text-decoration:none; color:#FFFFFF; font-weight: 700; 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