@article{JEMS_2004_6_1_a0,
     author = {Augusto C. Ponce},
     title = {An estimate in the spirit of {Poincar\'e's} inequality},
     journal = {Journal of the European Mathematical Society},
     pages = {1--15},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2004},
     doi = {10.4171/jems/1},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/1/}
}