Lassas, Matti
Oksanen, Lauri
Stefanov, Plamen
Uhlmann, Gunther
Funding for this research was provided by:
National Science Foundation (DMS-1301646)
Suomen Akatemia (272312)
Engineering and Physical Sciences Research Council (EP/L026473/1)
Article History
Received: 13 May 2015
Accepted: 1 March 2016
First Online: 16 November 2017