@article{NSJOM_1997_27_1a_10,
     author = {Munteanu 

 Gheorghe},
     title = {Higher 

 order {Gauge-invariant} {Lagrangians}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {101-115},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1997},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1997_27_1a_10/}
}