@article{SIGMA_2007_3_a113,
     author = {Alexander Balinsky and John Ryan},
     title = {Some {Sharp} $L^2$ {Inequalities} for {Dirac} {Type} {Operators}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2007},
     volume = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a113/}
}