@article{JCA_2010_17_3_JCA_2010_17_3_a21,
     author = {D. Percivale},
     title = {Upper and {Lower} {Bounds} for {Poincar\'e-type} {Constants} in {BH}},
     journal = {Journal of convex analysis},
     pages = {1089--1111},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JCA_2010_17_3_JCA_2010_17_3_a21/}
}