@article{10_4064_aa140_4_1,
     author = {Luis Arenas-Carmona},
     title = {Arithmetical {Hilbert} symbols, distance maps
 and cohomology},
     journal = {Acta Arithmetica},
     pages = {305--315},
     publisher = {mathdoc},
     volume = {140},
     number = {4},
     year = {2009},
     doi = {10.4064/aa140-4-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa140-4-1/}
}