Proceedings of the Bulgarian Academy of Sciences

<body> There are the pages of <b><big>"Proceedings of the Bulgarian Academy of Sciences"</big></b>. We publish reports of original scientific results in the field of mathematical, physical, technical, chemical, earth and life sciences written in English, Russian, French or German. The papers should contain only unpublished data in the respective scientific field. They can further be expanded to be published elsewhere.<br><br> <big><b>Tome 55</b></big><b>Contents</b><br> <h2>You must use frame enabled browser to view these pages.</h2> </body>