%0 Journal Article %A Granirer, Edmond E. %T Strong and Extremely Strong Ditkin sets forthe Banach Algebras Apr (G) = A p ⋂ L r (G) %J Canadian journal of mathematics %D 2011 %P 123-135 %V 63 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2010-077-0/ %R 10.4153/CJM-2010-077-0 %F 10_4153_CJM_2010_077_0