@Article{Baricz 2007, author="Á. Baricz ", title="Redheffer type inequality for Bessel functions", journal="JIPAM. J. Inequal. Pure Appl. Math.", year="2007", pages="6 pages", volume="8" } @Article{Chen2003, author="C. P. Chen, J. W. Zhao, F. Qi", title="Three inequalities involving hyperbolically trigonometric functions", journal="RGMIA res. rep. coll.", year="2003", pages="6 pages", volume="6" } @Article{Chu2016, author="H. H. Chu, Z. H. Yang, Y. M. Chu, W. Zhang", title="Generalized Wilker-type inequalities with two parameters", journal="J. Inequal. Appl.", year="2016", pages="13 pages", volume="2016" } @Article{Jiang2014, author="W. D. Jiang, Q. M. Luo, F. Qi", title="Refinements and sharpening of some Huygens and Wilker type inequalities", journal="Turkish J. Anal. Number Theory", year="2014", pages="134--139", volume="2" } @Article{Klén2010, author="R. Klén, M. Visuri, M. Vuorinen", title="On Jordan type inequalities for hyperbolic functions", journal="J. Inequal. Appl.", year="2010", pages="14 pages", volume="2010" } @Article{Lazarević1968, author="I. Lazarević", title="Sur une inégalité de Lochs", journal="(French) Univ. Beograd. Publ. Elektrotehn. Fak. Ser. Mat. Fiz. No.", year="1968", pages="55--56", volume="1968" } @Article{Lv2012, author="Y. Lv, G. Wang, Y. Chu", title="A note on Jordan type inequalities for hyperbolic functions", journal="Appl. Math. Lett.", year="2012", pages="505--508", volume="25" } @Book{Mitrinović1970, author="D. S. Mitrinović", title="Analytic Inequalities", year="1970", publisher="In cooperation with P. M. Vasić, Die Grundlehren der mathematischen Wissenschaften, Springer-Verlag", address="New York-Berlin" } @Article{Mortici2011, author="C. Mortici", title="The natural approach of Wilker-Cusa-Huygens inequalities", journal="Math. Inequal. Appl.", year="2011", pages="535--541", volume="14" } @Article{Neuman2012, author="E. Neuman", title="On Wilker and Huygens type inequalities", journal="Math. Inequal. Appl.", year="2012", pages=" 271--279", volume="15" } @Article{Neuman2010, author="E. Neuman, J. Sándor", title="On some inequalities involving trigonometric and hyperbolic functions with emphasis on the Cusa-Huygens, Wilker, and Huygens inequalities", journal="Math. Inequal. Appl.", year="2010", pages="715--723", volume="13" } @Article{Qi2009, author="F. Qi, D. W. Niu, B. N. Guo", title="Refinements, generalizations, and applications of Jordan's inequality and related problems", journal="J. Inequal. Appl.", year="2009", pages="52 pages", volume="2009" } @Article{Redheffer 969, author="R. Redheffer ", title="Problem 5642", journal="Amer. Math. Monthly", year="969", pages="422", volume="76" } @Article{Sándor2015, author="J. Sándor, B. A. Bhayo", title="On an inequality of Redheffer", journal="Miskolc Math. Notes", year="2015", pages="475--482", volume="16" } @Article{Wu 2009, author="S. H. Wu ", title="On extension and refinement of Wilker's inequality", journal="Rocky Mountain J. Math.", year="2009", pages="683--687", volume="39" } @Article{Wu2009, author="S. H. Wu, Á. Baricz", title="Generalizations of Mitrinović, Adamović and Lazarević's inequalities and their applications", journal="Publ. Math. Debrecen", year="2009", pages="447--458", volume="75" } @Article{Wu2012, author="S. H. Wu, L. Debnath", title=" Wilker-type inequalities for hyperbolic functions", journal="Appl. Math. Lett.", year="2012", pages="837--842", volume="25" } @Article{Wu2007, author="S. H. Wu, H. M. Srivastava", title="A weighted and exponential generalization of Wilker's inequality and its applications ", journal="Integral Transforms Spec. Funct.", year="2007", pages="529--535", volume="18" } @Article{Wu2008, author="S. H. Wu, H. M. Srivastava", title=" A further refinement of Wilker's inequality", journal="Integral Transforms Spec. Funct.", year="2008", pages="757--765", volume="19" } @Article{Yang2014, author="Z. H. Yang, Y. M. Chu", title="Sharp Wilker-type inequalities with applications", journal="J. Inequal. Appl.", year="2014", pages="17 pages", volume="2014" } @Article{Yang2015, author="Z. H. Yang, Y. M. Chu ", title="Jordan type inequalities for hyperbolic functions and their applications", journal="J. Funct. Spaces", year="2015", pages="4 pages", volume="2015" } @Article{Yang2015, author="Z. H. Yang, Y. M. Chu", title=" Lazarević and Cusa type inequalities for hyperbolic functions with two parameters and their applications", journal="J. Inequal. Appl.", year="2015", pages="19 pages", volume="2015" } @Article{Yang2016, author="Z. H. Yang, Y. M. Chu", title="A sharp double inequality involving trigonometric functions and its applications", journal="J. Math. Inequal.", year="2016", pages="423--432", volume="10" } @Article{Yang2015, author="Z. H. Yang, Y. M. Chu, X. H. Zhang", title="Sharp Cusa type inequalities with two parameters and their applications", journal="Appl. Math. Comput.", year="2015", pages="1177--1198", volume="268" } @Article{Zhu 2007, author="L. Zhu ", title="On Wilker type inequalities", journal="Math. Inequal. Appl.", year="2007", pages="727--731", volume="10" } @Article{Zhu2009, author="L. Zhu", title="Some new Wilker-type inequalities for circular and hyperbolic functions", journal="Abstr. Appl. Anal.", year="2009", pages="9 pages", volume="2009" }