%0 Journal Article %A Anders Barrlund %T Constrained least squares methods for linear timevarying DAE systems. %J Numerische Mathematik %D 1991 %P 145-162 %V 60 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1991__60_4_133589/ %F NUMA_1991__60_4_133589