@article{10_4171_dm_444,
     author = {Heng Xie},
     title = {An application of {Hermitian} {K-theory:} sums-of-squares formulas},
     journal = {Documenta mathematica},
     pages = {195--208},
     year = {2014},
     volume = {19},
     doi = {10.4171/dm/444},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/444/}
}