@article{10_4153_CMB_2011_143_x,
     author = {Hrube\v{s}, P. and Wigderson, A. and Yehudayoff, A.},
     title = {An {Asymptotic} {Bound} on the {Composition} {Number} of {Integer} {Sums} of {Squares} {Formulas}},
     journal = {Canadian mathematical bulletin},
     pages = {70--79},
     year = {2013},
     volume = {56},
     number = {1},
     doi = {10.4153/CMB-2011-143-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2011-143-x/}
}