Journal of Mathematical Analysis and Applications
Journal of Mathematical Analysis and Applications > 2011 > 380 > 2 > 888-892
Journal of Mathematical Analysis and Applications > 2011 > 380 > 2 > 632-641
Journal of Mathematical Analysis and Applications > 2011 > 380 > 2 > 888-892
Journal of Mathematical Analysis and Applications > 2011 > 380 > 2 > 632-641