@article{10_4153_CMB_2008_018_6,
     author = {Agarwal, Ravi P. and Otero-Espinar, Victoria and Perera, Kanishka and Vivero, Dolores R.},
     title = {Wirtinger's {Inequalities} on {Time} {Scales}},
     journal = {Canadian mathematical bulletin},
     pages = {161--171},
     year = {2008},
     volume = {51},
     number = {2},
     doi = {10.4153/CMB-2008-018-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2008-018-6/}
}