@article{1102905362, author = {Singer, Michael F.}, title = {Elementary solutions of differential equations.}, journal = {Pacific J. Math.}, volume = {61}, number = {2}, year = {1975}, pages = { 535-547}, language = {en}, url = {http://dml.mathdoc.fr/item/1102905362} }
Singer, Michael F. Elementary solutions of differential equations.. Pacific J. Math., Tome 61 (1975) no. 2, pp. 535-547. http://gdmltest.u-ga.fr/item/1102905362/