Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS2_1956__4_165605, author = {EARL A. CODDINGTON}, title = {On maximal symmetrie ordinary differential operators}, journal = {Mathematica Scandinavica}, pages = {22--28}, publisher = {mathdoc}, volume = {4}, year = {1956}, zbl = {0074.06702}, url = {http://geodesic.mathdoc.fr/item/MS2_1956__4_165605/} }
EARL A. CODDINGTON. On maximal symmetrie ordinary differential operators. Mathematica Scandinavica, Tome 4 (1956), pp. 22-28. http://geodesic.mathdoc.fr/item/MS2_1956__4_165605/