@article{NUMA_1970__15_131976,
     author = {P.G. CIARLET and R.S. VARGA and F. NATTERER},
     title = {Numerical {Methods} of {High-Order} {Accuracy} for {Singular} {Nonlinear} {Boundary} {Value} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {87--99},
     publisher = {mathdoc},
     volume = {15},
     year = {1970},
     zbl = {0211.19103},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1970__15_131976/}
}