“…Here we address the reader to some relevant papers [1], [2], [5], [4], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [21], [25], [26], [28], [29], [22], [23], [30], [31], [33], [34], [36], [37], [39], [43], [44], [45], [46] and the reference therein.…”