@article{10_4153_CJM_2012_006_2,
     author = {Helemskii, A. Ya.},
     title = {Extreme {Version} of {Projectivity} for {Normed} {Modules} {Over} {Sequence} {Algebras}},
     journal = {Canadian journal of mathematics},
     pages = {559--574},
     year = {2013},
     volume = {65},
     number = {3},
     doi = {10.4153/CJM-2012-006-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2012-006-2/}
}