Authors
N. Mironova-Ulmane
Institute of Solid State Physics, University of Latvia, Riga, Latvia
A. Kuzmin
Institute of Solid State Physics, University of Latvia, Riga, Latvia
I. Sildos
Institute of Physics, University of Tartu, Tartu, Estonia
L. Puust
Institute of Physics, University of Tartu, Tartu, Estonia
J. Grabis
Riga Technical University, Institute of Inorganic Chemistry, Riga, Latvia