@inbook{401686, title = {16 Differential equations with coincident central dispersions of the x-th and (x + 1)-th kinds (x=1,3)}, booktitle = {Linear Differential Transformations of the Second Order}, series = {GDML\_Books}, publisher = {The English Universities Press, Ltd.}, address = {London}, year = {1971}, pages = {[149]-156}, url = {http://dml.mathdoc.fr/item/401686} }
(éd.). 16 Differential equations with coincident central dispersions of the x-th and (x + 1)-th kinds (x=1,3), dans Linear Differential Transformations of the Second Order, GDML_Books, (1971), pp. [149]-156. http://gdmltest.u-ga.fr/item/401686/