by Balchev, I, Tzvetkova, Kr, Kolev, S, Terziiska, P, Szekeres, A, Miloushev, I, Tenev, T, Antonova, K, Peyeva, R, Ivanova, T, Avramova, I, Tzvetkov, M, Avdreev, G, Valcheva, E, Milenov, T, Tinchev, S
Published in Journal of physics. Conference series (01.10.2016)