University of Michigan, USA
http://www-personal.umich.edu/~borcea/
Chemnitz University of Technology, Germany
https://www.tu-chemnitz.de/mathematik/inverse_probleme/hofmann/
Yale University, USA
https://gauss.math.yale.edu/~js4228/
Case Western Reserve University, USA
https://sites.google.com/case.edu/erkkisomersalo/home
University of Washington, USA
https://sites.math.washington.edu/~gunther/
The Chinese University of Hong Kong, Hong Kong SAR
https://www.math.cuhk.edu.hk/~zou/