@inbook{400874, title = {Leonhard Euler [portr\'et]}, booktitle = {Teorie graf\r u, 1736--1963}, series = {GDML\_Books}, publisher = {Prometheus}, address = {Praha}, year = {1997}, pages = {104-104}, url = {http://dml.mathdoc.fr/item/400874} }
(éd.). Leonhard Euler [portrét], dans Teorie grafů, 1736–1963, GDML_Books, (1997), p. 104. http://gdmltest.u-ga.fr/item/400874/