Authors
M. Vanags
Institute of Physical Energetics, Riga, Latvia
K. Lebedeva
Institute of Physical Energetics, Riga, Latvia
A. Snegirjovs
Institute of Physical Energetics, Riga, Latvia
G. Kashkarova
Institute of Physical Energetics, Riga, Latvia
P. Shipkovs
Institute of Physical Energetics, Riga, Latvia