BibTeX
@ARTICLE{
         Campbell1993LSC,
       AUTHOR = "Stephen L. Campbell",
       TITLE = "Least Squares Completions for Nonlinear Differential Algebraic Equations",
       JOURNAL = "Numer. Math",
       VOLUME = "65",
       YEAR = "1993",
       PAGES = "77--94",
       REFERRED = "[Campbell1996ADa]."
}