%0 Journal Article %A Sagave, Steffen %T Spectra of units for periodic ring spectra and group completion of graded E∞ spaces %J Algebraic and Geometric Topology %D 2016 %P 1203-1251 %V 16 %N 2 %U http://geodesic.mathdoc.fr/articles/10.2140/agt.2016.16.1203/ %R 10.2140/agt.2016.16.1203 %F 10_2140_agt_2016_16_1203