@article{10_4064_sm206_2_3,
     author = {A. Ya. Helemskii},
     title = {Metric version of flatness and {Hahn{\textendash}Banach} type theorems for normed modules over sequence algebras},
     journal = {Studia Mathematica},
     pages = {135--160},
     publisher = {mathdoc},
     volume = {206},
     number = {2},
     year = {2011},
     doi = {10.4064/sm206-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm206-2-3/}
}