@inbook{401692, title = {III. General transformation theory}, booktitle = {Linear Differential Transformations of the Second Order}, series = {GDML\_Books}, publisher = {The English Universities Press, Ltd.}, address = {London}, year = {1971}, pages = {[195]-[195]}, url = {http://dml.mathdoc.fr/item/401692} }
(éd.). III. General transformation theory, dans Linear Differential Transformations of the Second Order, GDML_Books, (1971), p. [195]. http://gdmltest.u-ga.fr/item/401692/