@article{GDZPPN001171232, title = {Projection Methods and Singular Two Point Boundary Value Problems.}, journal = {Numerische Mathematik}, volume = {21}, year = {1973}, pages = {193-205}, zbl = {0281.65048}, url = {http://dml.mathdoc.fr/item/GDZPPN001171232} }
Reddien, G.W. Projection Methods and Singular Two Point Boundary Value Problems.. Numerische Mathematik, Tome 21 (1973) pp. 193-205. http://gdmltest.u-ga.fr/item/GDZPPN001171232/