@article{GDZPPN002073315,
title = {Zum Begriff des konservativen Systems.},
journal = {Elemente der Mathematik},
volume = {7},
year = {1952},
pages = {121-129},
zbl = {0048.17602},
url = {http://dml.mathdoc.fr/item/GDZPPN002073315}
}
Ziegler, Hans. Zum Begriff des konservativen Systems.. Elemente der Mathematik, Tome 7 (1952) pp. 121-129. http://gdmltest.u-ga.fr/item/GDZPPN002073315/