@article{10_4171_dm_192,
     author = {Daniel Dugger and Daniel C. Isaksen},
     title = {Algebraic $K$-theory and sums-of-squares formulas},
     journal = {Documenta mathematica},
     pages = {357--366},
     year = {2005},
     volume = {10},
     doi = {10.4171/dm/192},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/192/}
}