dichevd@abv.bg
koevh@abv.bg
tbakalova@seznam.cz
petr.louda@tul.cz
© 2014 D. Dichev, H. Koev, T. Bakalova, P. Louda, published by Slovak Academy of Sciences, Institute of Measurement ScienceThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.