@article{10_4064_aa114_4_5,
     author = {Kevin Hutchinson and Dermot Ryan},
     title = {Hilbert symbols as maps of functors},
     journal = {Acta Arithmetica},
     pages = {349--368},
     publisher = {mathdoc},
     volume = {114},
     number = {4},
     year = {2004},
     doi = {10.4064/aa114-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa114-4-5/}
}