@article{ehr2005,
   author  = "Lars Eld\'en and Per Christian Hansen and Marielba Rojas",
   title   = "Minimization of linear functionals defined on solutions of large-scale discrete ill-posed problems",
   journal = "BIT",
   volume  = 45,
   number  = 2,
   pages   = "329-340",
   year    = 2005
}