@article{10_4153_CJM_2010_077_0,
     author = {Granirer, Edmond E.},
     title = {Strong and {Extremely} {Strong} {Ditkin} sets forthe {Banach} {Algebras} {Apr} {(G)} = {A} p \ensuremath{\bigcap} {L} r {(G)}},
     journal = {Canadian journal of mathematics},
     pages = {123--135},
     year = {2011},
     volume = {63},
     number = {1},
     doi = {10.4153/CJM-2010-077-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2010-077-0/}
}