Ulf Hellsten
The Royal Institute of Technology, Stockholm 70, Sweden
Bo Kjellberg
The Royal Institute of Technology, Stockholm 70, Sweden
Folke Norstad
The Royal Institute of Technology, Stockholm 70, Sweden
TBD
mathscidoc:1701.332323
Henry Helson
University of California, Berkeley, Cal., USA
TBD
mathscidoc:1701.332320