@article{PPN585263027+DMDLOG_0005, title = {Chapter XXIII. Permutations and Combinations.}, booktitle = {Algebra Part 2}, series = {GDML\_Books}, publisher = {Black}, address = {Edinburgh}, year = {1889}, pages = {1}, url = {http://dml.mathdoc.fr/item/PPN585263027+DMDLOG_0005} }
(éd.). Chapter XXIII. Permutations and Combinations., dans Algebra Part 2, GDML_Books, (1889), p. 1. http://gdmltest.u-ga.fr/item/PPN585263027+DMDLOG_0005/