@article{10_4064_cm136_2_8,
     author = {Cristinel Mortici and H. M. Srivastava},
     title = {Estimates for the arctangent function
 related to {Shafer's} inequality},
     journal = {Colloquium Mathematicum},
     pages = {263--270},
     publisher = {mathdoc},
     volume = {136},
     number = {2},
     year = {2014},
     doi = {10.4064/cm136-2-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm136-2-8/}
}