Anastasiya Panchuk
Institute of Mathematics
National Academy of Sciences of Ukraine
Tereshchenkivska str., 3
01601 Kyiv, Ukraine
Tel: (+38044) 234 63 22
       (+38067) 408 06 70
Fax: (+38044) 235 20 10
e-mail: bifchaos@imath.kiev.ua
           ndca@imath.kiev.ua