E-print: arXiv:1001.3070
Published: 18 January 2010.
András Kroó
Alfred Renyi Institute of Mathematics
Hungarian Academy of Sciences
Budapest, Hungary
and
Budapest University of Technology and Economics
Department of Analysis
Budapest, Hungary
E-mail: kroo@renyi.hu
Allan Pinkus
Department of Mathematics
Technion
Haifa, Israel
E-mail: pinkus@tx.technion.ac.il