@article{10_21136_MB_1992_126056,
     author = {Pech, Pavel},
     title = {A sharpening of a discrete analog of {Wirtinger's} and isoperimetric inequalities},
     journal = {Mathematica Bohemica},
     pages = {425--428},
     publisher = {mathdoc},
     volume = {117},
     number = {4},
     year = {1992},
     doi = {10.21136/MB.1992.126056},
     mrnumber = {1197291},
     zbl = {0773.52005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1992.126056/}
}