@inbook{401682, title = {12 Introduction to the theory of central dispersions}, booktitle = {Linear Differential Transformations of the Second Order}, series = {GDML\_Books}, publisher = {The English Universities Press, Ltd.}, address = {London}, year = {1971}, pages = {[112]-117}, url = {http://dml.mathdoc.fr/item/401682} }
(éd.). 12 Introduction to the theory of central dispersions, dans Linear Differential Transformations of the Second Order, GDML_Books, (1971), pp. [112]-117. http://gdmltest.u-ga.fr/item/401682/