@article{PPN585262896+DMDLOG_0019, title = {Chapter XV. Variation of a Function.}, booktitle = {Algebra Part 1}, series = {GDML\_Books}, publisher = {Black}, address = {Edinburgh}, year = {1889}, pages = {310}, url = {http://dml.mathdoc.fr/item/PPN585262896+DMDLOG_0019} }
(éd.). Chapter XV. Variation of a Function., dans Algebra Part 1, GDML_Books, (1889), p. 310. http://gdmltest.u-ga.fr/item/PPN585262896+DMDLOG_0019/