Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1952__7_140585, author = {Hans Ziegler}, title = {Zum {Begriff} des konservativen {Systems.}}, journal = {Elemente der Mathematik}, pages = {121--129}, publisher = {mathdoc}, volume = {7}, year = {1952}, zbl = {0048.17602}, url = {http://geodesic.mathdoc.fr/item/ELMA_1952__7_140585/} }
Hans Ziegler. Zum Begriff des konservativen Systems.. Elemente der Mathematik, Tome 7 (1952), pp. 121-129. http://geodesic.mathdoc.fr/item/ELMA_1952__7_140585/