The authors correct part of Theorem 3.1 in the paper titled above 1 in order to avoid using inadequate inequalities and approximations while defining constant C. These corrections do not influence on the formulation of Theorem 3.1 and its conclusion. Also, parts of proof of Theorem 4.2 are corrected in order to avoid using inadequate inequalities. This corrections do not influence on conclusion of theorem. The authors apologize for any inconvenience that may have been caused.
Djordevic et al. (Wed,) studied this question.