%0 Journal Article %A Karin Cvetko-Vah %A Jens Hemelaer %A Jonathan Leech %T Noncommutative frames revisited %J Ars Mathematica Contemporanea %D 2020 %P 147-154 %V 19 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.26493/1855-3974.2219.554/ %R 10.26493/1855-3974.2219.554 %G en %F 10_26493_1855_3974_2219_554