%0 Journal Article %A Flad, Heinz-Jürgen %A Hackbusch, Wolfgang %A Schneider, Reinhold %T Best $N$-term approximation in electronic structure calculations I. One-electron reduced density matrix %J ESAIM: Modélisation mathématique et analyse numérique %D 2006 %P 49-61 %V 40 %N 1 %I EDP-Sciences %U http://archive.numdam.org/articles/10.1051/m2an:2006007/ %R 10.1051/m2an:2006007 %G en %F M2AN_2006__40_1_49_0