Journal of Mathematical Analysis and Applications
Journal of Mathematical Analysis and Applications > 2013 > 407 > 1 > 141-146
Journal of Mathematical Analysis and Applications > 2013 > 407 > 2 > 550-556
Journal of Mathematical Analysis and Applications > 2013 > 407 > 1 > 141-146
Journal of Mathematical Analysis and Applications > 2013 > 407 > 2 > 550-556