“…Among the recent references we can mention the works by Cherepanov [15], Cherepanov et al [16], Makarov and Romanova [42], Popov et al [51], Smolin et al [59], Stefanov [62], Liu at al. [37], Makarov, et al [43], Vaziri et al [63], Bar-on et al [7], Cocchetti and Perego, [19], Hoashi et al [28], Jing [30], Mariotti et al [44], Romanova et al [54], Wünnemann and Ivanov [73], Balokhonov et al [6], Bdzil at al. [8], Chen et al [14], Jing and Hudson [31].…”