@article{NUMA_1993__65_4_133724,
     author = {Stephen L. Campbell},
     title = {Least squares completions for nonlinear differential algebraic equations.},
     journal = {Numerische Mathematik},
     pages = {77--94},
     publisher = {mathdoc},
     volume = {65},
     number = {4},
     year = {1993},
     zbl = {0804.65066},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__65_4_133724/}
}