Preface of the special issue
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1.
School of Science and Technology, University of New England Armidale, NSW 2351, Australia
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2.
Department of Mathematics, National Tsing Hua University Hsinchu 300044, Taiwan
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3.
Department of Natural Science, Center for General Education Chang Gung University Guishan, Taoyuan 333, Taiwan
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4.
Department of Mathematics and Statistics Memorial University of Newfoundland St. John’s, NL A1C 5S7, Canada