“…For ~ = 1, ct = 4-1, l = 1,3,6, Theorem 7 (without the equality clause) has been proved by the author [7] (the cases (i), (ii), (iii), (iv) of [7] can easily be rewritten to the cases l -6, 3,3,1 respectively). Concerning inequalities related to (47) we refer to [2], [8].…”