@article{05137533,
title = {Symmetries of second-order potential differential systems.},
journal = {Balkan Journal of Geometry and its Applications (BJGA)},
volume = {10},
year = {2005},
pages = {129-141},
zbl = {1130.70008},
language = {en},
url = {http://dml.mathdoc.fr/item/05137533}
}
Soh, Celestin Wafo; Udrişte, Constantin. Symmetries of second-order potential differential systems.. Balkan Journal of Geometry and its Applications (BJGA), Tome 10 (2005) pp. 129-141. http://gdmltest.u-ga.fr/item/05137533/