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Journal of Mathematics and Applications > 2014 > Vol. 37 > 97--109
Journal of Mathematics and Applications > 2007 > Vol. 29 > 33-52
Journal of Mathematics and Applications > 2007 > Vol. 29 > 99-107
Journal of Mathematics and Applications > 2014 > Vol. 37 > 97--109
Journal of Mathematics and Applications > 2007 > Vol. 29 > 33-52
Journal of Mathematics and Applications > 2007 > Vol. 29 > 99-107